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is a radiologic sign indicating a deformity where fingers have the appearance of a pencil lying in a cup. This sign is classically seen in psoriatic arthritis, but it is also reported in systemic sclerosis and rheumatoid arthritis.
93:"Radiographic scoring systems for psoriatic arthritis are insufficient for psoriatic arthritis mutilans: results from the Nordic PAM Study"
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Laasonen, Leena; Lindqvist, Ulla; Iversen, Lars; Ejstrup, Leif; Jonmundsson, Thorarinn; Ståhle, Mona; Gudbjornsson, Bjorn (1 April 2020).
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Laasonen, Leena; Gudbjornsson, Björn; Ejstrup, Leif; Iversen, Lars; Ternowitz, Thomas; Ståhle, Mona; Lindqvist, Ulla (6 July 2015).
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Ramakrishnan, S.; Das, S. K.; Mishra, K. (May 2001). "Systemic sclerosis with pencil-in-cup deformity".
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42:"Delayed Diagnosis of Psoriatic Arthritis Mutilans due to Arthritis Prior to Skin Lesion"
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Mochizuki, Takeshi; Ikari, Katsunori; Okazaki, Ken (4 November 2018).
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