Idiopathic granulomatous mastitis (IGM) is a rare, benign breast disease without a clearly known etiology. It was first described by Kessler and Wolloch in 1972, hundreds of cases have been reported from all over the world. It is characterised by inflammation without necrosis. It has to be differentiated from simple mastitis and inflammatory carcinoma clinically and histological differentiation is of greater significance. There is no definitive classifications, scoring systems or certitudes. Mastitis can however also affect males and non-breastfeeding women. The aim of this study is to define a few causative factors related to the occurrence of the disease, which may aid in early diagnosis and treatment. We retrospectively analyzed the clinical, radiological and morphological features of 36 cases diagnosed as GM by histopathological study. In this study we attempted to describe the detailed clinical and histomorphological features, diagnostic clues for various specific and idiopathic GM.