術前に良性腫瘍と診断した乳腺問質肉腫の1例

Abstract

A 56-year-old woman consulted a hospital because of a left breast mass. Mammography suggested breast cancer (Category 4). Ultrasonography demonstrated a 2cm mass lesion with clear-irregular border. Magnetic Resonance lmaging (MRI) demonstrated a mass with invasive lesion. Fine needle aspiration biopsy classified the mass as indeterrninate. But we diagnosed this lesion as benign phyllodes tumor or fibroadenoma. Open biopsy was performed. Pathological examination revealed stromal sarcoma of the breast with positive surgical stumps. Four weeks after the primary surgery, pectoral muscle preserving mastectomy with sampling of the axillary lymph node was couducted. The patient is alive and recurrence-free 12 months after surgery.