A Rare Case of Idiopathic Granulomatous Mastitis in a Nulliparous Woman with Hyperprolactinemia

Idiopathic granulomatous mastitis (IGM) is a rare, benign, and chronic inflammatory condition of the breast. Women of child-bearing age with a recent history of pregnancy and lactation are usually affected, and clinical picture mimics inflammatory breast cancer or breast abscess. The etiology is not well defined but proposed to be a localized immune reaction to the breast tissue. Here, we report a case of a 41-year-old female who presented with left breast pain and discharge and a clinical diagnosis of breast abscess was made. No improvement with antibiotics was noted and she underwent mammography and diagnostic ultrasound of the affected breast. A biopsy of the lesion was obtained which revealed chronic granulomatous inflammation confirming the diagnosis of IGM. She was also found to have hyperprolactinemia secondary to a prolactinoma following which the patient was started on steroid and bromocriptine.