Abstract
A very rare case of schwannoma limited to the breast is reported. The patient was a 62-year-old woman who presented with a lump and pain in the right nipple region in February 2009. A tumor-like induration with mild tenderness, 30 mm in size, was observed in the nipple region of the right breast. Ultrasound examination showed a well-defined tumor, 30 mm in size, below the right nipple, and a well-defined cord-like shadow with a homogeneous interior that suggested intraductal progression was seen on the lateral side. No findings were observed on mammography, and cytology was negative (a small number of epithelial cells with little atypia was seen, with cells with naked nuclei scattered in the background) . Intraductal papilloma was suspected, and the patient was monitored. In August 2009, ultrasound showed that the tumor had enlarged to 45 × 25 mm. Repeat cytology in February 2010 was negative. Because the patient wished to undergo resection, surgery was performed in April 2011. Simple mastectomy was selected because the breast was small and the lesion was widely distributed on the lateral side of the breast below the nipple, and because the patient wanted a total resection. The tumor section was uniformly white, and pathological findings indicated a schwannoma. The tumor was mostly subcutaneous under the nipple.
