Sebaceous Carcinoma of the Breast in a Japanese Male with a Pathogenic Variant: Report of an Exceedingly Rare Case and Review of the Literature.

Introduction: Sebaceous carcinoma (SC) is a malignant neoplasm differentiated from the mature sebocyte and occurs mainly in the periorbital area. However, SC of the breast is extremely rare. We report a case of sebaceous breast carcinoma in a Japanese man with a pathogenic variant.