Pencil-in-cup deformity

Dr Ammar Haouimi and Dr Ian Bickle et al.

Pencil-in-cup deformity is the description given to one of the appearances on plain radiographs classically associated with psoriatic arthritis.

Radiographic features

The appearance results from periarticular erosions and bone resorption giving the appearance of a pencil in a cup.

Differential diagnosis

Although classically described with psoriatic arthritis, this appearance can also be seen in systemic sclerosisrheumatoid arthritis, or reactive arthritis.

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Article information

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

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Cases and figures

  • Figure 1
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  • Case 1
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  • Case 2
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  • Case 3: rheumatoid arthritis
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