In situ and infiltrating lobular carcinoma of the male breast.

An 82-year-old man presented with a right breast mass. Histologic examination of an excisional biopsy showed lobular in situ and infiltrating carcinoma. The patient was phenotypically male and had fathered children. There was no history of predisposing factors to breast lesions, such as drug use or gynecomastia. In our review, this is the first case of lobular in situ and infiltrating carcinoma of the male breast in a phenotypic and apparently genotypic male.