Hatchet sign (ankylosing spondylitis)

Hatchet sign refers to the limited erosion of the lateral aspect of the humeral head that produces a hatchet-shaped deformity. This finding is typically associated with ankylosing spondylitis.

In the absence of osteoporosis and the presence of sclerosis, this sign helps to differentiate it from rheumatoid arthritis.

Differential diagnosis

Inspired signs

Article information

rID: 26951
Section: Signs
Synonyms or Alternate Spellings:
  • Hatchet sign
  • Hatchet sign in ankylosing spondylitis

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Cases and figures

  • Case 1
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