Breast carcinoma occurs rarely in men. Its imaging by mammography is difficult because male breast tissue is normally small in volume and adequate compression is not possible, which is a prerequisite for performing mammography. The authors describe a 65-year-old man with a right breast mass in whom the result of fine-needle aspiration cytology was inconclusive. A mammogram was also noncontributory because adequate compression was not possible as the mass was tender. Tc-99m tetrofosmin scintimammography showed intense focal uptake in the right breast. Excision biopsy confirmed the diagnosis of breast carcinoma.