Pencil-in-cup deformity

Dr Daniel J Bell and Dr Ian Bickle et al.

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.

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Article information

rID: 33943
Section: Gamuts
Tag: stub, cases, refs
Synonyms or Alternate Spellings:
  • pencil in cup
  • pencil in a cup

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