Granular Cell Tumor of the Breast: A Case Report Describing Dynamic MR Mammography.

A case of granular cell tumor of the breast in a 36-year-old woman is reported. The patient presented with a hard mass,1.5 cm in diameter in the upper-outer quadrant of the left breast. Physical examination and ultrasonography suggested the presence of breast carcinoma. An aspiration biopsy cytology(ABC)specimen wasevaluated as class II, and dynamic magnetic resonance(MR)mammography indicated a benign tumor. Granular cell tumor was finally diagnosed on examination of an excisional biopsy specimen. Granular cell tumor of the breast can mimic breast carcinoma on physical examination, mammography, ultrasonography, and even gross inspection. Dynamic MR mammography has the potential distinguish this condition from carcinoma. Awareness of this disease and prudent use of diagnostic procedures, including MR mammography, will help prevent misdiagnosis and unnecessary surgery.