Idiopathic Granulomatous Mastitis

Table 1

Differential diagnosis of IGM.

---

IGM

(i) Cystic neutrophilic granulomatous mastitis

Inflammatory breast cancer

Infectious mastitis

(i) Bacterial

 Corynebacterium species, especially C. kroppenstedtii and C. tuberculostearium

 Periductal mastitis

 Actinomyces abscess

(ii) Tuberculous mastitis

(iii) Leprosy

(iv) Cat scratch disease

(v) Fungal

 Histoplasmosis

 Cryptococcosis

 Coccidiomycosis

(vi) Protozoal

 Schistosomiasis

Diabetic mastopathy

Autoimmune

(i) Vasculitis

(ii) Wegener’s granulomatosis

(iii) Giant cell arteritis

(iv) Takayasu’s arteritis

(v) Churg–Strauss syndrome

(vi) Breast sarcoidosis

(vii) Crohn’s disease

Foreign body granulomas

(i) Silicone, paraffin, PAAG injections, and beryllium

IgG4-RD mastitis

---