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Hemophagocytic lymphohistiocytosis

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51: 577: 793:, which can be used to estimate an individual's risk of HLH. In adults, soluble IL-2 receptor has been found to be a very sensitive marker for HLH, demonstrating 100% sensitivity for ruling out HLH below a cutoff of 2400 U/mL and optimal cutoff for ruling in at 2515 U/mL (sensitivity, 100%; specificity, 72.5%), with 93% specificity at >10 000 U/mL. 524:-dependent cytotoxicity. This inability to remove infected and antigen-presenting cells and terminate the immune response leads to uncontrolled proliferation and activation of the immune system with release of excessive cytokines. These cells then infiltrate organs, releasing more cytokines, which gives the clinical picture. The fever is caused by 154:
The onset of HLH occurs before the age of one year in approximately 70 percent of cases. Familial HLH should be suspected if siblings are diagnosed with HLH or if symptoms recur when therapy has been stopped. Familial HLH is an autosomal recessive disease, hence each sibling of a child with familial
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Bode SF, Ammann S, Al-Herz W, Bataneant M, Dvorak CC, Gehring S, Gennery A, Gilmour KC, Gonzalez-Granado LI, GroĂź-Wieltsch U, Ifversen M, Lingman-Framme J, Matthes-Martin S, Mesters R, Meyts I, van Montfrans JM, Pachlopnik Schmid J, Pai SY, Soler-Palacin P, Schuermann U, Schuster V, Seidel MG,
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Not all five out of eight criteria are required for diagnosis of HLH in adults, and a high index of suspicion is required for diagnosis as delay results in increased mortality. The diagnostic criteria were developed in pediatric populations and have not been validated for adult HLH patients.
844:(type 2). This is a rare autosomal recessive disorder characterized by partial albinism, hepatosplenomegaly, pancytopenia, hepatitis, immunologic abnormalities, and lymphohistiocytosis. Most cases have been diagnosed between 4 months and 7 years of age, with a mean age of about 17 months. 980:
A systematic review recently reported the pooled proportion are fever 97.2%, hepatomegaly 70.2%, splenomegaly 78.4%, thrombocytopenia 90.1%, anemia 76.0%, and serum ferritin ≥500 μg/L 97.1%. The case fatality rate is 14.6% among dengue hemophagocytic lymphohistiocytosis patients.
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HLH has a twenty-five–percent chance of developing the disease, a fifty-percent chance of carrying the defective gene (which is very rarely associated with any risk of disease), and a twenty-five–percent chance of not being affected and not carrying the gene defect.
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The diagnosis of acquired, or secondary, HLH is usually made in association with infection by viruses, bacteria, fungi, or parasites or in association with lymphoma, autoimmune disease, or metabolic disease. Acquired HLH may have decreased, normal, or increased
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HLH is a description of an immunophysiologic state in time. It can be dangerous to infer a genetic impairment of granule-mediated cytotoxicity in patients, especially older children and adults, who meet any of the various criteria for HLH. Thus, like
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Secondary haemophagocytic lymphohistiocytosis (acquired haemophagocytic lymphohistiocytosis) occurs after strong immunologic activation, such as that which can occur with systemic infection, immunodeficiency, or underlying malignancy.
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Benson LA, Li H, Henderson LA, Solomon IH, Soldatos A, Murphy J, Bielekova B, Kennedy AL, Rivkin MJ, Davies KJ, Hsu AP, Holland SM, Gahl WA, Sundel RP, Lehmann LE, Lee MA, Alexandrescu S, Degar BA, Duncan CN, Gorman MP (May 2019).
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The prognosis is guarded with an overall mortality of 50%. Poor prognostic factors included HLH associated with malignancy, with half the patients dying by 1.4 months compared to 22.8 months for non-tumour associated HLH patients.
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The underlying causes, either inherited or acquired, lead to an unchecked immune response when exposed to triggers. Impaired NK-cell cytotoxicity is the hallmark of HLH. All genetic defects for familial HLH are related to
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for four of the causative genes, PRF1 (FHL2), UNC13D (FHL3), STX11 (FHL4), and STXBP2 (FHL5), is available on a clinical basis. Symptoms of FHL are usually evident within the first few months of life and may even develop
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The vast majority of patients who meet these criteria will not have a genetic cause of their disease, but rather HLH will be triggered by infection, malignancy, rheumatic disease, and/or certain treatments (as in the
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Most patients who meet HLH criteria will have secondary cases. Treatment for these patients should focus on the underlying contributors. Additionally, treatment of the inflammation of HLH itself is often required.
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Both forms are characterized by the overwhelming activation of normal T lymphocytes and macrophages, invariably leading to clinical and haematologic alterations and death in the absence of treatment.
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level are markedly elevated. In children, a ferritin above 10000 is very sensitive and specific for the diagnosis of HLH, however, the diagnostic utility for ferritin is less for adult HLH patients.
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The first case report of HLH was published in 1939 under the term "Histiocytic Medullary Reticulosis". A second report would come out in 1952 that would rename the disorder that same year.
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only). However, long-term remission without the use of cytotoxic and immune-suppressive therapies is unlikely in the majority of adults with HLH and in those with involvement of the
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Five genetic subtypes (FHL1, FHL2, FHL3, FHL4, and FHL5) are described, with an estimated overall prevalence of one in 50,000 and equal gender distribution. Molecular
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Secondary HLH in some individuals may be self-limited because patients are able to fully recover after having received only supportive medical treatment (i.e., IV
2844: 672:(FHL) or familial erythrophagocytic lymphohistiocytosis, is a heterogeneous autosomal recessive disorder found to be more prevalent with parental consanguinity. 2756: 2682: 2370: 337: 2672: 1531:
Daver N, McClain K, Allen CE, Parikh SA, Otrock Z, Rojas-Hernandez C, Blechacz B, Wang S, Minkov M, Jordan MB, La Rosée P, Kantarjian HM (September 2017).
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and haemophagocytic syndrome, with abnormal T-cell and macrophage activation. This type has a grave prognosis if untreated. Type 3 has mutations in
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Fardet, Laurence (September 9, 2014). "Development and Validation of the HScore, a Score for the Diagnosis of Reactive Hemophagocytic Syndrome".
426:) are associated with, and thought to be triggered or promoted by, EBV infection. These cases of HLH are classified as belonging to the class of 1227:
Giang HT, Banno K, Minh LH, Trinh LT, Loc LT, Eltobgy A, Tai LL, Khan A, Tuan NH, Reda Y, Samsom M, Nam NT, Huy NT, Hirayama K (November 2018).
3451: 2804: 873: 3431: 1325:"The syndrome of hemophagocytic lymphohistiocytosis in primary immunodeficiencies: implications for differential diagnosis and pathogenesis" 3330: 2976: 1474:
Braga Neto, Manuel B.; Badley, Andrew D.; Parikh, Sameer A.; Graham, Rondell P.; Kamath, Patrick S. (2022-02-03). Solomon, Caren G. (ed.).
995: 810: 423: 2006:"Hematopoietic cell transplantation for hemophagocytic lymphohistiocytosis: a journey of a thousand miles begins with a single (big) step" 2520: 883:
has collected the published consensus management documents for the many contexts in which HLH occurs and they host full-text versions.
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Primary HLH is caused by high-penetrance variants in genes associated with the syndrome, and thus is part of the phenotype of several
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Speckmann C, Stepensky P, Sykora KW, Tesi B, Vraetz T, Waruiru C, Bryceson YT, Moshous D, Lehmberg K, Jordan MB, Ehl S (July 2015).
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Esteban, Ysabella M.; de Jong, Jill L. O.; Tesher, Melissa S. (1 August 2017). "An Overview of Hemophagocytic Lymphohistiocytosis".
941: 1229:"Dengue hemophagocytic syndrome: A systematic review and meta-analysis on epidemiology, clinical signs, outcomes, and risk factors" 693:
1. A molecular diagnosis consistent with HLH. These include the identification of pathologic mutations of PRF1, UNC13D, or STX11.
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Machowicz R, Janka G, Wiktor-Jedrzejczak W (March 2017). "Similar but not the same: Differential diagnosis of HLH and sepsis".
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Mehta, Puja; McAuley, Daniel F.; Brown, Michael; Sanchez, Emilie; Tattersall, Rachel S.; Manson, Jessica J. (2020-03-28).
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HLH as defined by the HLH-04 criteria (see below) is a descriptive diagnosis. Its individual components are non-specific.
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Clinical Commissioning Policy: Anakinra for Haemophagocytic Lymphohistiocytosis (HLH) for adults and children in all ages
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Clinical Commissioning Policy: Anakinra for Haemophagocytic Lymphohistiocytosis (HLH) for adults and children in all ages
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Nearly half of the cases of type 2 familial hemophagocytic lymphohistiocytosis are due to bi-allelic PRF1 mutations.
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Allen, Carl (June 2008). "Highly elevated ferritin levels and the diagnosis of hemophagocytic lymphohistiocytosis".
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causes such as bone marrow or other organ transplantations; chemotherapy; or therapy with immunosuppressing agents.
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Zhang, Kejian; Filopovich, Alexandra H.; Johnson, Judith; Marsh, Rebecca A.; Villanueva, Joyce (January 17, 2013).
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seen more often in children than in adults. It is a life-threatening disease of severe hyperinflammation caused by
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A subtype of primary HLH where the inflammation is limited to the central nervous system has been described.
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Wysocki CA (December 2017). "Comparing hemophagocytic lymphohistiocytosis in pediatric and adult patients".
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While optimal treatment of HLH is still being debated, current treatment regimes usually involve high dose
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About 33% of all HLH cases, ~75% of Asian HLH cases, and nearly 100% of HLH cases caused by mutations in
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Three types of Griscelli syndrome are recognised: type 1 has neurologic symptoms and mutations in
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and is characterized by partial albinism. This type does not pose a threat to those so affected.
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Scott, Ronald Bodley; Robb-Smith, A.H.T. (July 22, 1939). "Histiocytic Medullary Reticulosis".
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Decreased blood cell counts affecting at least two of three lineages in the peripheral blood:
565: 521: 372: 171: 167: 74: 3348: 3272: 2751: 2448: 2440: 2401: 2354: 2238: 2201: 2193: 2182:"Autoimmune lymphoproliferative syndrome misdiagnosed as hemophagocytic lymphohistiocytosis" 2152: 2144: 2097: 2058: 2017: 1976: 1968: 1926: 1869: 1861: 1820: 1771: 1732: 1691: 1683: 1607: 1597: 1554: 1546: 1537: 1495: 1487: 1446: 1438: 1397: 1387: 1346: 1338: 1288: 1240: 1198: 1158: 1117: 1107: 1037: 1029: 725: 717:
Haemoglobin <9 g/100 ml (in infants <4 weeks: haemoglobin <10 g/100 ml) (
650: 613: 609: 545: 364: 353: 230: 3045: 1811: 1533:"A consensus review on malignancy-associated hemophagocytic lymphohistiocytosis in adults" 851:. Prognosis depends on the severity of neurologic manifestations. Type 2 has mutations in 589: 443: 388: 314: 310: 186: 785:
In addition, in the case of familial HLH, no evidence of malignancy should be apparent.
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to attack EBV-infected cells. Malignant disorders associated with secondary HLH include
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On 20 November 2018, the FDA approved the anti-IFN-gamma monoclonal antibody
3406: 2906: 2586: 2562: 2133:"Soluble interleukin-2 receptor is a sensitive diagnostic test in adult HLH" 895: 616:. The liver function tests are usually elevated. A low level of the protein 537: 533: 163: 2462: 2444: 2366: 2250: 2215: 2197: 2166: 2109: 2072: 2031: 1990: 1940: 1883: 1834: 1807:"Marked hyperferritinemia does not predict for HLH in the adult population" 1783: 1746: 1705: 1653: 1621: 1568: 1509: 1491: 1460: 1411: 1360: 1300: 1252: 1210: 1172: 1131: 1094:
Machowicz, Rafal; Janka, Gritta; Wiktor-Jedrzejczak, Wieslaw (2016-01-01).
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syndromes. There are inherited and non-inherited (acquired) causes of HLH.
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Ponnatt, Tanya Sajan; Lilley, Cullen M.; Mirza, Kamran M. (2021-08-04).
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Secondary HLH (sHLH) is associated with, and thought to be promoted by,
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Fajgenbaum, David C.; June, Carl H. (2020-12-03). Longo, Dan L. (ed.).
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Rudman Spergel A, Walkovich K, Price S, et al. (November 2013).
2047:"How I treat hemophagocytic lymphohistiocytosis in the adult patient" 1244: 852: 821: 790: 761: 718: 601: 549: 548:. TNF-alpha and TNF-gamma may also lead to inhibition of lipoprotein 499: 481: 275: 263: 259: 251: 1376:"COVID-19: consider cytokine storm syndromes and immunosuppression" 1066:"Familial hemophagocytic lymphohistiocytosis: MedlinePlus Genetics" 454:
The five subtypes of FHL are each associated with a specific gene:
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and non-malignant diseases that likewise weaken the ability of the
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Other conditions that may be confused with this condition include
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In rheumatic diseases, this syndrome is more often referred to as
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Usmani, G. Naheed; Woda, Bruce A.; Newburger, Peter E. (2013).
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Jenkins RW, Clarke CJ, Lucas JT, et al. (November 2013).
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that present with hemophagocytic lymphohistiocytosis, such as
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Attempts to improve diagnosis of HLH have included use of the
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The differential diagnosis of HLH includes secondary HLH and
225:. The most common and best studied causes of Primary HLH are 706:(defined as a temperature >100.3 Â°F, >38 Â°C) 1957:"Pediatric CNS-isolated hemophagocytic lymphohistiocytosis" 1584:"Epstein–Barr Virus and Hemophagocytic Lymphohistiocytosis" 2427:
Farquhar, James W.; Claireaux, Albert E. (December 1952).
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Epstein–Barr virus–associated lymphoproliferative diseases
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Immune disorder in the blood leading to hyperinflammation
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2. Fulfillment of five out of the eight criteria below:
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use to kill targeted cells, such as those infected with
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Patients with HLH, especially when untreated, may need
2472: 3359: 3313: 3271: 3262: 3230: 3202: 3174: 3146: 3137: 3044: 2987: 2937: 2885: 2878: 2818: 2784: 2691: 2652: 2577: 2476: 1721:"Advances in understanding the pathogenesis of HLH" 690:The current (2008) diagnostic criteria for HLH are 73: 40: 35: 1280:Current Opinion in Allergy and Clinical Immunology 1670:, Thia KY, Andrews M, et al. (April 2013). 1145:Machowicz, Rafal; Basak, Grzegorz (2020-03-05). 996:X-linked lymphoproliferative disease § XLP2 2264:https://www.histiocytesociety.org/HLH-Consensus 1919:Archives of Pathology & Laboratory Medicine 1184: 1182: 914:have also been used. Other medications include 227:loss of function, (i.e. inactivating) mutations 201:, and elevated ferritin levels (among others). 1272: 1270: 2852: 2757:Hereditary progressive mucinous histiocytosis 2683:Congenital self-healing reticulohistiocytosis 2630: 1640:"Familial Hemophagocytic Lymphohistiocytosis" 747:in the blood (≤ 150 mg/100 ml) 600:—including a decreased number of circulating 8: 670:familial haemophagocytic lymphohistiocytosis 2603:Familial Hemophagocytic Lymphohistiocytosis 424:X-linked lymphoproliferative disease type 1 3268: 3143: 3050: 2882: 2859: 2845: 2837: 2637: 2623: 2615: 2473: 1633: 1631: 49: 32: 2452: 2205: 2156: 2062: 2021: 2004:Jordan MB, Filipovich AH (October 2008). 1980: 1930: 1899:at the U.S. National Library of Medicine 1873: 1824: 1736: 1695: 1611: 1601: 1558: 1499: 1450: 1401: 1391: 1350: 1222: 1220: 1162: 1121: 1111: 1041: 840:A major differential diagnosis of HLH is 191:yellow discoloration of the skin and eyes 1017:"Hemophagocytic syndromes and infection" 2231:Critical Reviews in Oncology/Hematology 1007: 818:autoimmune lymphoproliferative syndrome 3331:Congenital generalized lipodystrophy 3 2805:Interdigitating dendritic cell sarcoma 2429:"Familial Haemophagocytic Reticulosis" 944:) to be used in the treatment of HLH. 824:, which may be extremely challenging. 2373:from the original on October 18, 2021 411:. Secondary HLH may also result from 7: 3303:Hemophagocytic lymphohistiocytosis 4 1915:"Hemophagocytic Lymphohistiocytosis" 1151:Polish Archives of Internal Medicine 811:X-linked lymphoproliferative disease 540:is due to the suppressive effect on 363:Secondary HLH also occurs rarely in 342:adult onset forms of Still's disease 334:macrophage activation syndrome (MAS) 1897:Lymphohistiocytosis,+Hemophagocytic 183:enlargement of the liver and spleen 105:haemophagocytic lymphohistiocytosis 2955:Cranio-lenticulo-sutural dysplasia 2868:Inherited disorders of trafficking 2766:Multicentric reticulohistiocytosis 2712:Hemophagocytic lymphohistiocytosis 741:High blood levels of triglycerides 97:hemophagocytic lymphohistiocytosis 36:Hemophagocytic lymphohistiocytosis 25: 3345:Limb-girdle muscular dystrophy 2B 2810:Follicular dendritic cell sarcoma 2747:Progressive nodular histiocytosis 2737:Generalized eruptive histiocytoma 2694:non-Langerhans cell histiocytosis 942:interleukin 1 receptor antagonist 387:); and infections caused by EBV, 139:. It is classified as one of the 3457:Diseases of immune dysregulation 3220:Hereditary spastic paraplegia 10 3002:X-linked intellectual disability 2776:Indeterminate cell histiocytosis 2433:Archives of Disease in Childhood 2243:10.1016/j.critrevonc.2017.03.023 2149:10.1182/bloodadvances.2017012310 1961:Neurol Neuroimmunol Neuroinflamm 1805:Schram, Alison (March 5, 2015). 598:decreased numbers of blood cells 596:The blood count typically shows 556:. Activated macrophages secrete 369:severe combined immunodeficiency 229:in genes that code for proteins 3192:Hereditary spastic paraplegia 4 2673:Hand–SchĂĽller–Christian disease 2288:from the original on 2019-04-23 1480:New England Journal of Medicine 1431:New England Journal of Medicine 1076:from the original on 2021-01-25 223:inborn errors of immunity (IEI) 2131:Hayden, Anna (December 2017). 2045:Schram, Alison (May 7, 2015). 1725:British Journal of Haematology 803:macrophage-activation syndrome 629:erythrocyte sedimentation rate 336:and occurs most frequently in 177:HLH clinically manifests with 1: 3452:Autosomal recessive disorders 2732:Benign cephalic histiocytosis 2655:Langerhans cell histiocytosis 2406:10.1016/S0140-6736(00)61951-7 2341:Parikh, Sameer (April 2014). 1393:10.1016/S0140-6736(20)30628-0 642:level is usually low and the 350:juvenile idiopathic arthritis 135:that secrete high amounts of 3432:vesicular transport proteins 2872:vesicular transport proteins 2359:10.1016/j.mayocp.2013.12.012 2306:NHS England (October 2021). 2281:Food and Drug Administration 2089:Arthritis & Rheumatology 2064:10.1182/blood-2015-01-551622 1973:10.1212/NXI.0000000000000560 1826:10.1182/blood-2014-10-602607 1763:Pediatric Blood & Cancer 1343:10.3324/haematol.2014.121608 1293:10.1097/ACI.0000000000000405 1203:10.3928/19382359-20170717-01 964:(brain and/or spinal cord). 346:systemic lupus erythematosus 3016:Hermansky–Pudlak syndrome 2 668:Primary HLH, also known as 612:. The bone marrow may show 580:Light microscopic image of 3478: 807:primary immunodeficiencies 505:Syntaxin binding protein 2 365:immunodeficiency disorders 319:acute lymphocytic leukemia 125:uncontrolled proliferation 3427: 3413:Distal muscular dystrophy 3401: 3097: 3075: 3053: 2965: 2913:Hermansky–Pudlak syndrome 1932:10.5858/arpa.2020-0802-RA 1113:10.1186/s13054-016-1369-3 1015:Fisman, David N. (2000). 916:cytokine targeted therapy 756:Haemophagocytosis in the 710:Enlargement of the spleen 656:Bone marrow biopsy shows 212:cytokine release syndrome 57: 48: 3361:Vacuolar protein sorting 3248:Spinocerebellar ataxia 5 2927:ChĂ©diak–Higashi syndrome 2707:Juvenile xanthogranuloma 1901:Medical Subject Headings 1603:10.3389/fimmu.2017.01902 940:(a modified recombinant 731:Neutrophils <1Ă—10/L ( 724:Platelets <100Ă—10/L ( 620:in the blood is common. 377:Wiskott–Aldrich syndrome 327:myelodysplastic syndrome 117:haemophagocytic syndrome 2800:Langerhans cell sarcoma 2787:malignant histiocytosis 2717:Erdheim-Chester disease 2347:Mayo Clinic Proceedings 1589:Frontiers in Immunology 1476:"Calm before the Storm" 18:Hemophagocytic syndrome 2727:Sea-blue histiocytosis 2678:Eosinophilic granuloma 2445:10.1136/adc.27.136.519 2198:10.1542/peds.2012-2748 2010:Bone Marrow Transplant 1492:10.1056/NEJMcps2111163 1034:10.3201/eid0606.000608 962:central nervous system 797:Differential diagnosis 593: 554:triglyceride synthesis 385:dyskeratosis congenita 348:. It occurs rarely in 323:acute myeloid leukemia 137:inflammatory cytokines 2826:Rosai–Dorfman disease 2762:Reticulohistiocytosis 2742:Xanthoma disseminatum 2668:Letterer–Siwe disease 1443:10.1056/NEJMra2026131 1022:Emerging Infect. Dis. 579: 562:plasminogen activator 381:ataxia–telangiectasia 3164:Griscelli syndrome 1 3123:Griscelli syndrome 3 3087:Griscelli syndrome 2 2770:Reticulohistiocytoma 2722:Niemann–Pick disease 2660:X-type histiocytosis 2023:10.1038/bmt.2008.232 588:containing numerous 358:rheumatoid arthritis 187:enlarged lymph nodes 121:hematologic disorder 65:within macrophages. 2795:Histiocytic sarcoma 2699:Non-X histiocytosis 1164:10.20452/pamw.15226 772:natural killer cell 686:Diagnostic criteria 646:level is elevated. 3349:Long QT syndrome 9 2578:External resources 2322:on 13 October 2021 1688:10.4161/onci.24185 1551:10.1002/cncr.30826 881:Histiocyte Society 879:The International 842:Griscelli syndrome 836:Griscelli syndrome 625:C reactive protein 594: 592:in their cytoplasm 338:the juvenile onset 243:Epstein-Barr virus 147:Signs and symptoms 3439: 3438: 3423: 3422: 3258: 3257: 3133: 3132: 3040: 3039: 2879:Vesicle formation 2834: 2833: 2612: 2611: 2102:10.1002/art.38690 1866:10.1002/ajh.23535 1776:10.1002/pbc.21423 1738:10.1111/bjh.12293 1582:Marsh RA (2017). 1386:(10229): 1033–4. 606:white blood cells 566:hyperfibrinolysis 544:by TNF-alpha and 373:DiGeorge syndrome 231:cytotoxic T cells 216:CART cell therapy 172:internal medicine 168:hyperferritinemia 160:intensive therapy 119:, is an uncommon 103:), also known as 89: 88: 30:Medical condition 16:(Redirected from 3469: 3273:Synaptic vesicle 3269: 3144: 3051: 2883: 2861: 2854: 2847: 2838: 2752:Papular xanthoma 2639: 2632: 2625: 2616: 2474: 2467: 2466: 2456: 2439:(136): 519–525. 2424: 2418: 2417: 2389: 2383: 2382: 2380: 2378: 2338: 2332: 2331: 2329: 2327: 2321: 2315:. Archived from 2314: 2303: 2297: 2296: 2294: 2293: 2272: 2266: 2261: 2255: 2254: 2226: 2220: 2219: 2209: 2177: 2171: 2170: 2160: 2128: 2122: 2121: 2083: 2077: 2076: 2066: 2042: 2036: 2035: 2025: 2001: 1995: 1994: 1984: 1951: 1945: 1944: 1934: 1910: 1904: 1894: 1888: 1887: 1877: 1845: 1839: 1838: 1828: 1802: 1796: 1795: 1757: 1751: 1750: 1740: 1716: 1710: 1709: 1699: 1664: 1658: 1657: 1635: 1626: 1625: 1615: 1605: 1579: 1573: 1572: 1562: 1528: 1522: 1521: 1503: 1471: 1465: 1464: 1454: 1427:"Cytokine Storm" 1422: 1416: 1415: 1405: 1395: 1371: 1365: 1364: 1354: 1319: 1313: 1312: 1274: 1265: 1264: 1245:10.1002/rmv.2005 1224: 1215: 1214: 1191:Pediatric Annals 1186: 1177: 1176: 1166: 1142: 1136: 1135: 1125: 1115: 1091: 1085: 1084: 1082: 1081: 1062: 1056: 1055: 1045: 1012: 928:In October 2021 753:≥ 500 ng/ml 726:thrombocytopenia 651:sphingomyelinase 614:hemophagocytosis 584:showing stromal 354:Kawasaki disease 214:associated with 109:British spelling 53: 33: 21: 3477: 3476: 3472: 3471: 3470: 3468: 3467: 3466: 3442: 3441: 3440: 3435: 3419: 3397: 3355: 3309: 3289:CEDNIK syndrome 3254: 3226: 3198: 3170: 3129: 3093: 3071: 3036: 2983: 2961: 2933: 2874: 2865: 2835: 2830: 2814: 2780: 2697: 2687: 2658: 2648: 2643: 2613: 2608: 2607: 2573: 2572: 2485: 2471: 2470: 2426: 2425: 2421: 2400:(6047): 194–8. 2391: 2390: 2386: 2376: 2374: 2340: 2339: 2335: 2325: 2323: 2319: 2312: 2305: 2304: 2300: 2291: 2289: 2274: 2273: 2269: 2262: 2258: 2228: 2227: 2223: 2179: 2178: 2174: 2143:(26): 2529–34. 2130: 2129: 2125: 2085: 2084: 2080: 2057:(19): 2908–14. 2044: 2043: 2039: 2003: 2002: 1998: 1953: 1952: 1948: 1912: 1911: 1907: 1895: 1891: 1860:(11): E265–72. 1847: 1846: 1842: 1819:(10): 1548–52. 1804: 1803: 1799: 1759: 1758: 1754: 1718: 1717: 1713: 1666: 1665: 1661: 1637: 1636: 1629: 1581: 1580: 1576: 1545:(17): 3229–40. 1530: 1529: 1525: 1473: 1472: 1468: 1437:(23): 2255–73. 1424: 1423: 1419: 1373: 1372: 1368: 1321: 1320: 1316: 1276: 1275: 1268: 1226: 1225: 1218: 1188: 1187: 1180: 1144: 1143: 1139: 1093: 1092: 1088: 1079: 1077: 1070:medlineplus.gov 1064: 1063: 1059: 1014: 1013: 1009: 1004: 987: 978: 970: 950: 892:corticosteroids 865: 838: 799: 688: 666: 602:red blood cells 590:red blood cells 574: 517: 515:Pathophysiology 444:genetic testing 440: 389:cytomegalovirus 315:B-cell lymphoma 311:T-cell lymphoma 207: 149: 63:red blood cells 31: 28: 23: 22: 15: 12: 11: 5: 3475: 3473: 3465: 3464: 3459: 3454: 3444: 3443: 3437: 3436: 3428: 3425: 3424: 3421: 3420: 3418: 3417: 3416: 3415: 3402: 3399: 3398: 3396: 3395: 3394: 3393: 3391:Cohen syndrome 3381: 3380: 3379: 3366: 3364: 3357: 3356: 3354: 3353: 3352: 3351: 3335: 3334: 3333: 3320: 3318: 3311: 3310: 3308: 3307: 3306: 3305: 3293: 3292: 3291: 3278: 3276: 3266: 3264:Vesicle fusion 3260: 3259: 3256: 3255: 3253: 3252: 3251: 3250: 3237: 3235: 3228: 3227: 3225: 3224: 3223: 3222: 3209: 3207: 3200: 3199: 3197: 3196: 3195: 3194: 3181: 3179: 3172: 3171: 3169: 3168: 3167: 3166: 3153: 3151: 3141: 3135: 3134: 3131: 3130: 3128: 3127: 3126: 3125: 3113: 3112: 3111: 3098: 3095: 3094: 3092: 3091: 3090: 3089: 3076: 3073: 3072: 3070: 3069: 3068: 3067: 3054: 3048: 3042: 3041: 3038: 3037: 3035: 3034: 3033: 3032: 3020: 3019: 3018: 3006: 3005: 3004: 2991: 2989: 2985: 2984: 2982: 2981: 2980: 2979: 2966: 2963: 2962: 2960: 2959: 2958: 2957: 2944: 2942: 2935: 2934: 2932: 2931: 2930: 2929: 2917: 2916: 2915: 2896: 2894: 2880: 2876: 2875: 2866: 2864: 2863: 2856: 2849: 2841: 2832: 2831: 2829: 2828: 2822: 2820: 2816: 2815: 2813: 2812: 2807: 2802: 2797: 2791: 2789: 2782: 2781: 2779: 2778: 2773: 2759: 2754: 2749: 2744: 2739: 2734: 2729: 2724: 2719: 2714: 2709: 2703: 2701: 2689: 2688: 2686: 2685: 2680: 2675: 2670: 2664: 2662: 2650: 2649: 2644: 2642: 2641: 2634: 2627: 2619: 2610: 2609: 2606: 2605: 2594: 2582: 2581: 2579: 2575: 2574: 2571: 2570: 2559: 2548: 2537: 2517: 2502: 2486: 2481: 2480: 2478: 2477:Classification 2469: 2468: 2419: 2384: 2353:(4): 484–492. 2333: 2298: 2284:. 2019-03-06. 2267: 2256: 2221: 2192:(5): e1440–4. 2172: 2137:Blood Advances 2123: 2096:(9): 2613–20. 2078: 2037: 1996: 1946: 1925:(4): 507–519. 1905: 1889: 1854:Am. J. Hematol 1840: 1797: 1770:(6): 1227–35. 1752: 1731:(5): 609–622. 1711: 1676:Oncoimmunology 1659: 1627: 1574: 1523: 1486:(5): 479–485. 1466: 1417: 1366: 1314: 1287:(6): 405–413. 1266: 1216: 1197:(8): e309–13. 1178: 1137: 1086: 1057: 1006: 1005: 1003: 1000: 999: 998: 993: 986: 983: 977: 974: 969: 966: 958:immunoglobulin 949: 946: 906:is also used. 904:immunoglobulin 902:. Intravenous 864: 861: 837: 834: 798: 795: 783: 782: 775: 770:Low or absent 768: 754: 748: 738: 737: 736: 729: 722: 712: 707: 687: 684: 665: 664:Classification 662: 573: 570: 516: 513: 509: 508: 495: 486: 477: 464: 439: 436: 206: 203: 148: 145: 141:cytokine storm 113:hemophagocytic 87: 86: 77: 71: 70: 55: 54: 46: 45: 42: 38: 37: 29: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3474: 3463: 3462:Histiocytosis 3460: 3458: 3455: 3453: 3450: 3449: 3447: 3434: 3433: 3426: 3414: 3411: 3410: 3409: 3408: 3404: 3403: 3400: 3392: 3389: 3388: 3387: 3386: 3382: 3378: 3375: 3374: 3373: 3372: 3368: 3367: 3365: 3362: 3358: 3350: 3346: 3343: 3342: 3341: 3340: 3336: 3332: 3329: 3328: 3327: 3326: 3322: 3321: 3319: 3316: 3312: 3304: 3301: 3300: 3299: 3298: 3294: 3290: 3287: 3286: 3285: 3284: 3280: 3279: 3277: 3274: 3270: 3267: 3265: 3261: 3249: 3246: 3245: 3244: 3243: 3239: 3238: 3236: 3233: 3229: 3221: 3218: 3217: 3216: 3215: 3211: 3210: 3208: 3205: 3201: 3193: 3190: 3189: 3188: 3187: 3183: 3182: 3180: 3177: 3173: 3165: 3162: 3161: 3160: 3159: 3155: 3154: 3152: 3149: 3145: 3142: 3140: 3136: 3124: 3121: 3120: 3119: 3118: 3114: 3110: 3109:Choroideremia 3107: 3106: 3105: 3104: 3100: 3099: 3096: 3088: 3085: 3084: 3083: 3082: 3078: 3077: 3074: 3066: 3063: 3062: 3061: 3060: 3056: 3055: 3052: 3049: 3047: 3043: 3031: 3028: 3027: 3026: 3025: 3021: 3017: 3014: 3013: 3012: 3011: 3007: 3003: 3000: 2999: 2998: 2997: 2993: 2992: 2990: 2986: 2978: 2975: 2974: 2973: 2972: 2968: 2967: 2964: 2956: 2953: 2952: 2951: 2950: 2946: 2945: 2943: 2940: 2936: 2928: 2925: 2924: 2923: 2922: 2918: 2914: 2911: 2910: 2909: 2908: 2903: 2902: 2898: 2897: 2895: 2892: 2888: 2884: 2881: 2877: 2873: 2869: 2862: 2857: 2855: 2850: 2848: 2843: 2842: 2839: 2827: 2824: 2823: 2821: 2817: 2811: 2808: 2806: 2803: 2801: 2798: 2796: 2793: 2792: 2790: 2788: 2783: 2777: 2774: 2771: 2767: 2763: 2760: 2758: 2755: 2753: 2750: 2748: 2745: 2743: 2740: 2738: 2735: 2733: 2730: 2728: 2725: 2723: 2720: 2718: 2715: 2713: 2710: 2708: 2705: 2704: 2702: 2700: 2695: 2690: 2684: 2681: 2679: 2676: 2674: 2671: 2669: 2666: 2665: 2663: 2661: 2656: 2651: 2647: 2646:Histiocytosis 2640: 2635: 2633: 2628: 2626: 2621: 2620: 2617: 2604: 2600: 2599: 2595: 2593: 2589: 2588: 2584: 2583: 2580: 2576: 2569: 2565: 2564: 2560: 2558: 2554: 2553: 2549: 2547: 2543: 2542: 2538: 2536: 2533: 2530: 2527: 2523: 2522: 2518: 2516: 2512: 2511: 2507: 2503: 2501: 2497: 2496: 2492: 2488: 2487: 2484: 2479: 2475: 2464: 2460: 2455: 2450: 2446: 2442: 2438: 2434: 2430: 2423: 2420: 2415: 2411: 2407: 2403: 2399: 2395: 2388: 2385: 2372: 2368: 2364: 2360: 2356: 2352: 2348: 2344: 2337: 2334: 2318: 2311: 2310: 2302: 2299: 2287: 2283: 2282: 2277: 2271: 2268: 2265: 2260: 2257: 2252: 2248: 2244: 2240: 2236: 2232: 2225: 2222: 2217: 2213: 2208: 2203: 2199: 2195: 2191: 2187: 2183: 2176: 2173: 2168: 2164: 2159: 2154: 2150: 2146: 2142: 2138: 2134: 2127: 2124: 2119: 2115: 2111: 2107: 2103: 2099: 2095: 2091: 2090: 2082: 2079: 2074: 2070: 2065: 2060: 2056: 2052: 2048: 2041: 2038: 2033: 2029: 2024: 2019: 2015: 2011: 2007: 2000: 1997: 1992: 1988: 1983: 1978: 1974: 1970: 1966: 1962: 1958: 1950: 1947: 1942: 1938: 1933: 1928: 1924: 1920: 1916: 1909: 1906: 1902: 1898: 1893: 1890: 1885: 1881: 1876: 1871: 1867: 1863: 1859: 1855: 1851: 1844: 1841: 1836: 1832: 1827: 1822: 1818: 1814: 1813: 1808: 1801: 1798: 1793: 1789: 1785: 1781: 1777: 1773: 1769: 1765: 1764: 1756: 1753: 1748: 1744: 1739: 1734: 1730: 1726: 1722: 1715: 1712: 1707: 1703: 1698: 1693: 1689: 1685: 1682:(4): e24185. 1681: 1677: 1673: 1669: 1663: 1660: 1655: 1651: 1647: 1646: 1641: 1634: 1632: 1628: 1623: 1619: 1614: 1609: 1604: 1599: 1595: 1591: 1590: 1585: 1578: 1575: 1570: 1566: 1561: 1556: 1552: 1548: 1544: 1540: 1539: 1534: 1527: 1524: 1519: 1515: 1511: 1507: 1502: 1497: 1493: 1489: 1485: 1481: 1477: 1470: 1467: 1462: 1458: 1453: 1448: 1444: 1440: 1436: 1432: 1428: 1421: 1418: 1413: 1409: 1404: 1399: 1394: 1389: 1385: 1381: 1377: 1370: 1367: 1362: 1358: 1353: 1348: 1344: 1340: 1337:(7): 978–88. 1336: 1332: 1331: 1330:Haematologica 1326: 1318: 1315: 1310: 1306: 1302: 1298: 1294: 1290: 1286: 1282: 1281: 1273: 1271: 1267: 1262: 1258: 1254: 1250: 1246: 1242: 1238: 1234: 1233:Rev Med Virol 1230: 1223: 1221: 1217: 1212: 1208: 1204: 1200: 1196: 1192: 1185: 1183: 1179: 1174: 1170: 1165: 1160: 1156: 1152: 1148: 1141: 1138: 1133: 1129: 1124: 1119: 1114: 1109: 1105: 1101: 1100:Critical Care 1097: 1090: 1087: 1075: 1071: 1067: 1061: 1058: 1053: 1049: 1044: 1039: 1035: 1031: 1027: 1024: 1023: 1018: 1011: 1008: 1001: 997: 994: 992: 991:Emperipolesis 989: 988: 984: 982: 975: 973: 967: 965: 963: 959: 954: 947: 945: 943: 939: 935: 931: 926: 924: 919: 917: 913: 909: 905: 901: 897: 893: 888: 884: 882: 877: 875: 871: 862: 860: 858: 854: 850: 845: 843: 835: 833: 831: 825: 823: 819: 814: 812: 808: 804: 796: 794: 792: 786: 780: 776: 773: 769: 767: 763: 759: 755: 752: 749: 746: 742: 739: 734: 730: 727: 723: 720: 716: 715: 713: 711: 708: 705: 702: 701: 700: 697: 694: 691: 685: 683: 680: 677: 673: 671: 663: 661: 659: 658:histiocytosis 654: 653:is elevated. 652: 647: 645: 641: 636: 634: 630: 626: 621: 619: 615: 611: 607: 603: 599: 591: 587: 583: 578: 571: 569: 567: 563: 559: 555: 552:or stimulate 551: 547: 543: 542:hematopoiesis 539: 535: 531: 527: 523: 514: 512: 506: 502: 501: 496: 494:(Syntaxin 11) 493: 492: 487: 484: 483: 478: 475: 471: 470: 465: 463: 462: 457: 456: 455: 452: 450: 445: 437: 435: 433: 429: 425: 421: 416: 414: 410: 406: 402: 398: 394: 390: 386: 382: 378: 374: 370: 366: 361: 359: 355: 351: 347: 343: 339: 335: 330: 328: 324: 320: 316: 312: 308: 307:immune system 304: 299: 297: 296: 291: 289: 285: 281: 277: 273: 269: 265: 261: 257: 253: 248: 245:(EBV) or the 244: 240: 236: 232: 228: 224: 219: 217: 213: 204: 202: 200: 199:transaminitis 196: 192: 188: 184: 180: 175: 173: 169: 165: 161: 156: 152: 146: 144: 142: 138: 134: 130: 126: 122: 118: 114: 110: 106: 102: 98: 94: 85: 81: 78: 76: 72: 68: 67:H&E stain 64: 60: 56: 52: 47: 43: 39: 34: 19: 3429: 3405: 3383: 3377:ARC syndrome 3369: 3337: 3323: 3302: 3295: 3281: 3240: 3212: 3184: 3156: 3139:Cytoskeleton 3115: 3101: 3079: 3057: 3022: 3008: 2994: 2969: 2947: 2919: 2905: 2899: 2711: 2596: 2585: 2561: 2550: 2539: 2519: 2504: 2489: 2436: 2432: 2422: 2397: 2393: 2387: 2377:December 14, 2375:. Retrieved 2350: 2346: 2336: 2324:. Retrieved 2317:the original 2308: 2301: 2290:. Retrieved 2279: 2270: 2259: 2234: 2230: 2224: 2189: 2185: 2175: 2140: 2136: 2126: 2093: 2087: 2081: 2054: 2050: 2040: 2016:(7): 433–7. 2013: 2009: 1999: 1964: 1960: 1949: 1922: 1918: 1908: 1892: 1857: 1853: 1843: 1816: 1810: 1800: 1767: 1761: 1755: 1728: 1724: 1714: 1679: 1675: 1662: 1643: 1593: 1587: 1577: 1542: 1536: 1526: 1483: 1479: 1469: 1434: 1430: 1420: 1383: 1379: 1369: 1334: 1328: 1317: 1284: 1278: 1239:(6): e2005. 1236: 1232: 1194: 1190: 1157:(5): 431–7. 1154: 1150: 1140: 1103: 1099: 1089: 1078:. Retrieved 1069: 1060: 1028:(6): 601–8. 1025: 1020: 1010: 979: 971: 955: 951: 933: 927: 920: 908:Methotrexate 889: 885: 878: 866: 857:melanophilin 846: 839: 826: 815: 800: 787: 784: 698: 695: 692: 689: 681: 678: 674: 669: 667: 655: 648: 637: 622: 595: 518: 510: 498: 489: 480: 467: 459: 453: 448: 441: 419: 417: 362: 331: 300: 293: 250: 247:Dengue virus 220: 208: 176: 157: 153: 150: 116: 112: 104: 100: 96: 90: 3176:Microtubule 2598:GeneReviews 1967:(3): e560. 1645:GeneReviews 936:, allowing 930:NHS England 912:vincristine 900:cyclosporin 766:lymph nodes 758:bone marrow 733:neutropenia 586:macrophages 582:bone marrow 564:leading to 430:and termed 352:, juvenile 133:macrophages 129:lymphocytes 41:Other names 3446:Categories 2891:Melanosome 2552:DiseasesDB 2394:The Lancet 2326:14 October 2292:2018-11-20 2186:Pediatrics 1668:Trapani JA 1656:. NBK1444. 1380:The Lancet 1106:(1): 215. 1080:2021-01-24 1002:References 932:published 923:emapalumab 832:activity. 745:fibrinogen 640:fibrinogen 638:The serum 623:The serum 485:(Munc13-4) 413:iatrogenic 409:SARS-CoV-2 127:of benign 93:hematology 84:immunology 80:Hematology 59:Micrograph 3430:See also 2819:Ungrouped 2587:eMedicine 2568:234437005 2563:SNOMED CT 1518:246488008 948:Prognosis 896:etoposide 863:Treatment 805:or other 610:platelets 572:Diagnosis 546:TNF-gamma 538:cytopenia 534:TNF-alpha 507:)/UNC18-2 303:malignant 241:like the 239:pathogens 164:cytopenia 75:Specialty 3315:Caveolae 3232:Spectrin 2977:CDOG IIE 2887:Lysosome 2785:WHO-III/ 2463:13008468 2371:Archived 2367:24581757 2286:Archived 2251:28477737 2237:: 1–12. 2216:24101757 2167:29296904 2118:43419202 2110:24782338 2073:25758828 2032:18679369 1991:31044148 1941:34347856 1884:23828274 1835:25573993 1792:25546028 1784:18085676 1747:23577835 1706:23734337 1654:20301617 1622:29358936 1596:: 1902. 1569:28621800 1510:35108473 1461:33264547 1412:32192578 1361:26022711 1309:11439142 1301:28957822 1261:52002485 1253:30109914 1211:28806468 1173:32134401 1132:27389585 1074:Archived 1052:11076718 985:See also 976:Research 938:Anakinra 777:Soluble 774:activity 751:Ferritin 633:ferritin 558:ferritin 474:Perforin 449:in utero 438:Genetics 432:EBV+ HLH 401:protozoa 397:bacteria 393:HIV/AIDS 367:such as 235:NK cells 193:, and a 61:showing 3204:Kinesin 2692:WHO-II/ 2592:ped/745 2546:D051359 2454:1988563 2414:6131175 2207:3813387 2158:5728644 1982:6467688 1875:4348111 1697:3654607 1613:5766650 1560:5568927 1501:8830531 1452:7727315 1403:7270045 1352:4486233 1123:4937543 1043:2640913 968:History 830:NK cell 644:D-dimer 618:albumin 522:granule 344:and in 174:wards. 111:), and 3385:VPS13B 3371:VPS33B 3283:SNAP29 3242:SPTBN2 3148:Myosin 3081:RAB27A 2949:SEC23A 2653:WHO-I/ 2535:603552 2532:608898 2529:603553 2526:267700 2461:  2451:  2412:  2365:  2249:  2214:  2204:  2165:  2155:  2116:  2108:  2071:  2030:  1989:  1979:  1939:  1903:(MeSH) 1882:  1872:  1833:  1790:  1782:  1745:  1704:  1694:  1652:  1620:  1610:  1567:  1557:  1538:Cancer 1516:  1508:  1498:  1459:  1449:  1410:  1400:  1359:  1349:  1307:  1299:  1259:  1251:  1209:  1171:  1130:  1120:  1050:  1040:  853:RAB27A 822:sepsis 791:HScore 762:spleen 719:anemia 631:, and 608:, and 550:lipase 536:; 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Index

Hemophagocytic syndrome

Micrograph
red blood cells
H&E stain
Specialty
Hematology
immunology
hematology
British spelling
hematologic disorder
uncontrolled proliferation
lymphocytes
macrophages
inflammatory cytokines
cytokine storm
intensive therapy
cytopenia
hyperferritinemia
internal medicine
fever
enlargement of the liver and spleen
enlarged lymph nodes
yellow discoloration of the skin and eyes
rash
transaminitis
cytokine release syndrome
CART cell therapy
inborn errors of immunity (IEI)
loss of function, (i.e. inactivating) mutations

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