A rare case of breast cancer in a transgender woman.

We report a case of breast cancer in a transgender woman (assigned male sex at birth, gender identity female) of Ashkenazi Jewish descent with BRCA2 mutation who had been taking cross-sex hormone therapy for 2 years. In addition to demonstrating breast cancer imaging findings and risk factors, this case draws attention to the paucity of research and data regarding breast cancer in transgender women and exemplifies the need for evidence-based consensus breast cancer screening recommendations for transgender women.