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Pencil-in-cup sign
Radiologic sign in psoriatic arthritis From Wikipedia, the free encyclopedia
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The pencil-in-cup sign is a radiologic sign indicating a deformity where fingers have the appearance of a pencil lying in a cup.[1][2][3] This sign is classically seen in psoriatic arthritis, but it is also reported in systemic sclerosis and rheumatoid arthritis.[4]
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