Granulomatous mastitis secondary to histoplasmosis: report of a case diagnosed by fine-needle aspiration biopsy.

A case of unilateral histoplasmal "granulomatous" mastitis diagnosed by fine-needle aspiration biopsy (FNAB) is presented. The clinical presentation and mammographic findings were strongly suspicious for carcinoma. FNAB cytology showed a picture of necrotizing granuloma secondary to histoplasmosis. The lesion was treated with surgical excision and appropriate antifungal therapy. The differential diagnosis of granulomatous mastitis is discussed.