Abstract
Breast cancer in men is rare, accounting for 0.5-1% of all breast cancers. Among these breast cancers, noninvasive intracystic carcinoma is an extremely rare malignant form. We report a case of noninvasive intracystic carcinoma managed with breast conserving surgery. A 76-year-old man presented with a mass beneath the left areola with mild nipple dimpling. Physical examination revealed a 2-cm mass, well defined without axillary lymph node involvement. Mammography showed a high density mass with well-defined smooth margins (category 3). Ultrasonography showed a cystic lesion with a mural mass projecting from the wall of the cyst. These findings suggested an intracystic tumor with high suspicion of malignancy (category 4). Cytological features were suggestive but not conclusive (class III) and a core biopsy of the intracystic mass revealed malignancy but could not confirm in situ or invasive carcinoma. Breast conserving surgery was completed without axillary clearance. Histological examination revealed noninvasive intracystic carcinoma. The patient underwent breast radiation and was doing well at the 6-month follow-up examination.
