Bilateral synchronous ductal carcinoma in situ in a young man: case report and review of the literature.

We report a rare case of synchronous bilateral ductal carcinoma in situ (DCIS) developing in a man with long-standing gynecomastia. He underwent bilateral staged subcutaneous mastectomies with the right side being performed first at age 26 years. Histology confirmed bilateral pure DCIS. There was no identifiable causative factor for the development of bilateral DCIS, and there was no familial history of the disease. He ultimately experienced progression to total bilateral mastectomies. This case highlights the importance of remaining vigilant about the presence of malignancy in normally benign conditions.