Metastasis to the breast as a presenting feature of extramammary malignancy is extremely uncommon. Often in this setting, the distinction between primary and secondary breast malignancy can be challenging. Ovarian or primary peritoneal metastasis to the breast is suggestive of disseminated disease and associated with a guarded prognosis, thus accurate differentiation is crucial for early and appropriate intervention. We report the case of a patient presenting with what initially appeared to be locally advanced breast cancer but subsequent review of pathology and imaging confirmed the presence of metastatic primary peritoneal cancer.
