Bilateral Metachronous Breast Cancer in a Patient: A Case Report

The presence of breast malignancy bilaterally is not a common case scenario. With reference to the time of occurrence, a second primary malignancy can be either synchronous or metachronous. The synchronous cancer of the breast can also be present in the same breast. Usually, in metachronous bilateral breast cancer (MBBC), the histologically same type of malignancy is seen at different periods. However, we present a case of MBBC in a 62-year-old female patient who had two histologically different types of breast cancer. She presented in hospital with a lump in her right breast and a fungating mass in her left breast. On biopsy right-sided lump was invasive ductal carcinoma while the left-sided mass was borderline phyllodes tumor, at two separate biopsies from renowned histopathology labs. After chemotherapy for IDC, a simple mastectomy with a wide margin of skin was performed on the left side, while on the right side, a modified radical mastectomy was performed.