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JAMA Dermatology Clinicopathological Challenge
November 2013

A Nodule in the Groin

Author Affiliations
  • 1Guys and St Thomas’ Hospitals Trust, London, England
  • 2St John’s Institute of Dermatology, London, England
  • 3King’s College London School of Medicine, London, England
JAMA Dermatol. 2013;149(11):1343-1344. doi:10.1001/jamadermatol.2013.4358

A man in his 70s was referred with a 3-month history of an enlarging, asymptomatic nodule in the left side of his groin. He had no history of systemic malignant disease but had recently undergone Mohs micrographic surgery to treat an infiltrative basal cell carcinoma on the left temple. On examination, there was a 17 × 10-mm firm, violaceous nodule in the left side of the groin (Figure, A, arrow). He had no associated lymphadenopathy, and findings from a full skin examination were otherwise normal. An incisional biopsy was performed, and the associated histologic findings are shown in the Figure, B and C.

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