Idiopathic granulomatous mastitis: surgery, treatment, and reconstruction.

Idiopathic granulomatous mastitis is a rare inflammatory breast disease that mimics breast diseases such as inflammatory breast carcinoma, infective mastitis, and inflammatory breast disease of known cause. It is a diagnosis made only after excluding other causes, and although the disease is nonmalignant it may be both locally aggressive and recurrent. Definitive treatment may require radical excision and adjunctive treatment with immunosuppressants.