Abstract
A healthy 65-year-old man presented with a 4-month history of left flank pain and nocturia. Dermatologic examination revealed multiple eruptive seborrheic keratoses, which he reported had developed over the previous 1 to 2 years (Panels A and B). Abdominal ultrasound examination and computed tomography (CT) revealed a localized mass (7 cm by 5 cm in diameter) of the left lower renal pole with central necrosis. A left total nephrectomy was performed, and histopathological examination confirmed a renal-cell carcinoma. The tumor infiltrated to, but did not penetrate, Gerota's fascia. The cutaneous findings were consistent with the diagnosis of the Leser–Trelat sign, . . .
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