Abstract
We report a case of a hemangioma of the breast that mimicked a mammary angiosarcoma. A 67-year-old woman developed a tumor in the left breast. On mammography, a 1 cm isodense well-circumscribed mass without microcalcification was found. On ultrasound, an 8 mm hypoechoic region with a regular border in the subcutaneous tissue of the peripheral region of the left breast. On MRI, a high intensity mass was seen on T1-weighted images, and the time-intensity curve showed enhancement in the early phase and slow wash-out in the delayed phase. On pathology of the core needle biopsy, angiosarcoma of the breast was suspected due to the specimen's high MIB-1 index. To make a definitive diagnosis, a lumpectomy was performed. On pathology, the MIB-1 index was low and there were no atypical cells ; a diagnosis of hemangioma without cellular atypia was made.
