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JAMA Dermatology Clinicopathological Challenge |

A Serpiginous Plaque on the Trunk QUIZ

Lawrence Feigenbaum, MD1; Kiran Motaparthi, MD1,2; Mark Fradin, MD3
[+] Author Affiliations
1Department of Dermatology, The University of Texas Southwestern Medical Center, Dallas
2Department of Dermatopathology, Miraca Life Sciences, Irving, Texas
3Chapel Hill Dermatology, Chapel Hill, North Carolina
JAMA Dermatol. 2016;152(7):831-832. doi:10.1001/jamadermatol.2016.0348.
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A man in his 70s presented with a 4.0-cm linear plaque with an 8.0-mm erythematous nodule on one end on his right upper abdomen; the lesion appeared 2 months prior and had been mildly itchy. What is your diagnosis?

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A, Photograph shows a serpiginous erythematous plaque on the abdomen. B, Histopathological analysis of a punch biopsy specimen demonstrates eosinophilic cuticle (external tegument) and calcareous bodies (basophilic internal structures). C, Histopathological analysis of a punch biopsy specimen. D, Detail of a longitudinal section.

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