Overview on idiopathic granulomatous mastitis -- Epidemiology -- Etiology and pathogenesis -- The role of genetic factors -- Clinical manifestations and classification -- Microbiology and biological markers -- Imaging studies in idiopathic granulomatous mastitis -- Imaging appearances and differential diagnosis of idiopathic granulomatous mastitis -- Pathology of idiopathic granulomatous mastitis -- Pathological differential diagnoses for granulomatous mastitis -- Medical treatment and prognosis -- Surgical treatment.