Bilateral atypical ductal hyperplasia, an incidental finding in gynaecomastia--case report and literature review.

Male breast cancer is a rare disease. Atypical ductal hyperplasia (ADH) in men is much rarer, and bilateral involvement is exceptional. A 20-year-old male presented with bilateral gynaecomastia who underwent subcutaneous mastectomies and histopathology revealed bilateral ADH. At 24 months, completion mastectomies were performed on both sides. The residual breast tissue revealed ADH similar to the initial specimen. ADH in women increases the risk of breast cancer by four to five times. To our knowledge, this is the first case report of bilateral ADH in a gynaecomastia specimen.