Pencil-in-cup deformity is the description given to one of the appearances on plain radiograph in psoriatic arthritis.
The appearance results from periarticular erosions and bone resorption giving the appearance of a pencil in a cup.
Although classically described with psoriatic arthritis, this appearance can also be seen in systemic sclerosis, rheumatoid arthritis or reactive arthritis.
- 1. Siannis F, Farewell VT, Cook RJ, Schentag CT, Gladman DD. Clinical and radiological damage in psoriatic arthritis. Annals of the rheumatic diseases. 65 (4): 478-81. doi:10.1136/ard.2005.039826 - Pubmed
- 2. S. Ramakrishnan, S. K. Das, K. Mishra; Systemic sclerosis with pencil‐in‐cup deformity, Rheumatology, Volume 40, Issue 5, 1 May 2001, Pages 594–595, doi.org/10.1093/rheumatology/40.5.594
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