Invasive classic lobular carcinoma represents a risk factor for bilateral lobular as well as ductal breast cancers. Some patients elect to undergo bilateral mastectomies with prophylactic simple mastectomy of the contralateral breast. We report a case of a 63year old female, with history of Stage I right breast invasive lobular carcinoma diagnosed twelve years previously, status post bilateral mastectomies with tram flap placement. She presents with a right chest wall nodule. The chest wall incisional biopsies and right breast tram pedicle needle core biopsies reveal invasive well differentiated ductal carcinoma grade 1 (Nottingham score, 1+2+1=4). The subsequent right tram flap mastectomy shows well differentiated glands extending into the pectoralis major muscle fibers. The tumor measures 4.7cm in the greatest dimension and demonstrates perineural involvement and vessel wall invasion. After bilateral prophylactic mastectomies in patients with BRCA1 and BRCA2 mutations, up to 1.9% develop breast cancer. Invasive breast cancers can arise in small foci of residual breast tissue. Even well differentiated ductal carcinoma can behave aggressively with vascular wall, perineural, and skeletal muscle invasion. The periodic follow up of breast cancer patients even greater than 10 years after bilateral mastectomies is important.
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