What is pencil-in-cup sign?

Pencil-in-cup is a radiologic sign indicating a deformity where fingers have the appearance of a pencil lying in a cup.¹²³ This sign is classically seen in psoriatic arthritis, but it is also reported in systemic sclerosis and rheumatoid arthritis.⁴

References

Original source: pencil-in-cup sign. Shared with Creative Commons Attribution-ShareAlike 3.0 License

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