Fig. 1

A prostatic blue nevus in transurethral resection specimen. a Two photomicrographs of the prostate with stromal dendritic melanocytes with dense brown deposits of melanin, intermixed between benign glands (HE, 40x). b Comparison of the same area with HE and Fontana-Masson (40x). c Details of dendritic melanocytes in HE (100x and 400x). d Comparison of other area with HE and Fontana-Masson (40x). E) Detail of dendritic melanocytes stained with Fontana-Masson (400x)