Primary sarcoid of the breast with incidental malignancy.

Breast sarcoidosis is rare and usually presents in patients with known sarcoid involving other organ systems. In the breast, sarcoidosis may mimic malignancy which must be excluded by core biopsy. We report a very unusual case of primary breast sarcoidosis with incidentally discovered breast carcinoma. The roles of mammography, ultrasound, and MRI in the diagnosis as well as other potential differential diagnosis are discussed.