Desmoid tumor of the breast: the role of proton magnetic resonance spectroscopy for a benign breast lesion mimicking a malignancy.

Desmoid tumor of the breast is an extremely rare condition. It is difficult to provide a correct preoperative diagnosis of desmoid tumor of the breast because of its tendency to mimic breast carcinoma on physical examination and conventional imaging such as mammography and sonography. We present a case of desmoid tumor of the breast that mimicked breast carcinoma, in which proton magnetic resonance spectroscopy assisted the result of biopsy, thus enabling a correct preoperative diagnosis.