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JAMA Dermatology Clinicopathological Challenge
March 2015

Eroded and Pedunculated Buttock Nodule

Author Affiliations
  • 1University of Botswana, Gaborone, Botswana
  • 2Children’s Hospital of Philadelphia and Department of Dermatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
  • 3Department of Dermatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
JAMA Dermatol. 2015;151(3):335-336. doi:10.1001/jamadermatol.2014.3238

A man in his 60s presented with a slowly enlarging, painful mass on his buttock. He recalled that a small lesion had appeared approximately 8 months prior, and over the past several months he had noted significant growth and pain. A nonpruritic rash had also become apparent on his forearms and thighs. Physical examination showed a 2-cm macerated pedunculated growth on the left buttock within the intergluteal cleft (Figure, A). An erythematous rash was noted on the forearms and thighs with fine scale present at the wrists.

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