Granular cell tumor in a male breast: mammographic, sonographic, and pathologic features.

Granular cell tumor (myoblastoma) is a rare soft tissue tumor that can present in the breast, producing mammographic and physical exam findings that may be indistinguishable from breast carcinoma. Multifocal lesions in male patients are very unusual. We present a case of a male patient with a granular cell tumor of the breast that was imaged on mammography and sonography. Definitive diagnosis was made with ultrasound-guided core biopsy followed by surgical excision. On clinical examination, the patient demonstrated multiple subcutaneous lesions that were also found to represent granular cell tumor.