ABSTRACT
Idiopathic granulomatous mastitis (IGM) is an uncommon and curious condition of unknown etiology. However, its association with the use of oral contraceptive pills, autoimmune disorders, hyperprolactinaemia and Corynebacterium species has been proposed. It occurs in young parous women and presents as a firm tender lump that may be mistaken for carcinoma. Histopathologically proven IGM initially show breast masses which were suspected of having breast carcinoma. So, detailed histopathological examination of the cases which are suspected as carcinoma is mandatory. We present a case of painless breast lump with radiological suspicion of malignancy and diagnosed as Idiopathic Granulomatous mastitis without any underlying cause. Correct diagnosis requires the exclusion of infectious etiologies, other causes of granulomatous mastitis and malignancy combined with definitive histopathological confirmation.