[pT1c Breast Cancer Presenting with Skin Rupture without Skin Invasion-A Case Report].

We report a case of breast bleeding caused by breast cancer without skin invasion. A woman in her 70s was aware of a mass in her right breast but left it untreated. About 6 months after noticing the mass, she visited our hospital due to bleeding from the right breast. Although needle biopsy did not reveal a diagnosis of breast cancer, we diagnosed her as having breast cancer based on clinical findings and recommended her to have surgery. Her consent was not obtained. Approximately 1 year later, she experienced bleeding from her right breast and visited our hospital. A tumor was identified, a biopsy was performed, and a diagnosis of breast cancer was made. A right lumpectomy and sentinel lymph node biopsy was carried out. Pathological diagnosis was invasive ductal carcinoma. No skin invasion was observed. The final diagnosis was pT1c, pN0 (sn), M0, pStageⅠ. After surgery, the patient was treated with tamoxifen and radiation therapy, and is currently free of recurrence.