Abstract
INTRODUCTION AND IMPORTANCE: Infarction occurs occasionally in benign mammary tumors but is extremely rare in breast cancer, with few cases having been reported. PRESENTATION OF CASE: A 53-year-old woman presented to our hospital with a mass and pain in the upper lateral region of the right breast. She underwent a needle biopsy and was histologically diagnosed as having invasive carcinoma. A ring-enhancing spherical mass was seen on contrast-enhanced computed tomography and magnetic resonance images. She underwent a right partial mastectomy with sentinel lymph node biopsy for T2N0M0 breast cancer. Macroscopically, the tumor was a yellow mass. Histopathologically, the site contained extensively necrotic tissue with foam cell aggregation, lymphocytic infiltration, and fibrosis in the periphery. No viable tumor cells were observed. The patient was followed up without postoperative chemotherapy or radiotherapy. CLINICAL DISCUSSION: Ultrasound examination performed before the biopsy showed blood flow inside the tumor, but a review of the histopathological tissue after surgery revealed generally low viability of the tumor cells in the biopsy specimen, and the possibility that the tumor had a strong tendency to be necrotic from the beginning was considered. It is presumed that some immunological mechanism was working. CONCLUSION: We have encountered a case of breast cancer with complete infarct necrosis. Infarct necrosis may be present if a contrast-enhanced image shows ring-like contrast.