Extramammary metastases to the breast: Radiologic and histologic review.

Extramammary metastases to the breast are extremely rare and vary widely in their clinical and imaging features. Diagnosis may be challenging as lesions can mimic both primary breast cancer as well as benign breast lesions. The goal of this review is to describe the radiologic and pathologic features of the most common primary tumors that metastasize to the breast including lymphoma, melanoma, lung carcinoma, gynecologic carcinoma and sarcomas.