Figure 1
From: Unusual histopathological diagnosis of prostatic blue nevus: a case report
Prostatic blue nevus. A) Macroscopic study, prostate gland, left lobe with a well-defined 1.4cm blackish area. B) Dusty and granular melanin pigment within myofibroblasts in the stroma (hematoxylin and eosin stain; inset ×40). C) Masson-Fontana stain highlights pigmented stromal cells, confirming the presence of melanin (×40). D) Negative iron reaction in the pigmented stroma cells (×40). E) Pigmented stroma cells immunopositive for S100 protein (×40).