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May 2009

A Firm Red-Brown Plaque on the Arm—Quiz Case

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Copyright 2009 American Medical Association. All Rights Reserved. Applicable FARS/DFARS Restrictions Apply to Government Use.2009

Arch Dermatol. 2009;145(5):589-594. doi:10.1001/archdermatol.2009.88-a

A 61-year-old white woman with a history of melanoma presented with an enlarging and asymptomatic lesion on her left arm for several months. Physical examination of the left deltoid revealed a 1.9 × 0.7-cm asymmetric, erythematous, and faintly brown plaque that was partially firm (Figure 1). Under dermoscopy, a patchy network and dotted blood vessels were observed. An excisional biopsy was performed for diagnosis (Figure 2 and Figure 3).