REPORT OF A CASE
A 62-year-old man was referred to the outpatient clinic of our department with an 8-month history of a discoloration of his penis. The lesion was never painful or pruritic and, according to the patient, there was no preexisting nevus or pigmented spot. The patient's medical history was unremarkable.The examination revealed a 2.5- to 3.0-cm graybrown pigmentation with a bluish hue on the prepuce that felt slightly infiltrated to palpation (Fig 1). The outline of the lesion was poorly defined, and only partial retraction of the prepuce was possible. The prepuce exhibited a brown nodule of 0.8 cm. The lymph nodes were nonpalpable, and the remainder of the physical examination showed normal findings. A chest roentgenogram and an abdominal sonogram were normal.A biopsy specimen of the prepuce, including the nodule, was obtained (Figs 2 through 4).What is your diagnosis?
Malignant melanoma of the penis