Table 1.

Distinguishing features of tuberculous mastitis and idiopathic granulomatous mastitis

Granulomatous Mastitis
	Idiopathic granulomatous mastitis	Tuberculous mastitis
Clinical	Appears after pregnancy	No relation to pregnancy
	No constitutional symptoms	Constitutional symptoms present
	No relation to breast feeding	No relation to breast feeding
	Possible relation with oral pills	No relation with oral pills
	Age 17 - 42 years	Any age
	Parous patients	Parous and Nonparous
	Hard mass, any site of breast but spare subareolar area	Hard mass any site of breast
	Bilateral is uncommon	Bilateral is common
	Rare nipple discharge	Occasional nipple discharge
	Tenderness present	Tenderness rare
	Rare axillary LN enlargement	Axillary LN can be enlarged
	Size of mass 1 - 8 cm	Size of mass 1 - 8 cm
	Clinically and Radiologically mimics carcinoma	Clinically and Radiologically mimics carcinoma
	Idiopathic	Tuberculosis
Histology	Lobules of Breast are affected	Any component of Breast tissue is affected (lobules, ducts and fat)
	Granulomas within the lobules	Granulomas anywhere
	Granuloma composed of Histiocytes, Langhans giant cells, lymphocytes, plasma cells and occasional eosinophilis	Granuloma composed of Histiocytes, Langhans giant cells, lymphocytes, rare plasma cells and eosinophilis
	Caseation necrosis absent	Cascation necrosis present
	Fat necrosis	Fat necrosis
	Fibrosis	Fibrosis
	Abscess common	Abscess uncommon