title: Granulomatous lobular mastitis secondary toMycobacterium fortuitum.
abstract: Granulomatous lobular mastitis is a rare inflammatory disease of the breast of unknown etiology. Most present as breast masses in women of child-bearing age. A 29-year-old female presented with a swollen, firm and tender right breast, initially misdiagnosed as mastitis. Core needle biopsy revealed findings consistent with granulomatous lobular mastitis, and cultures were all negative for an infectious etiology. She was started on steroid therapy to which she initially responded well. A few weeks later she deteriorated and was found to have multiple breast abscesses. She underwent operative drainage and cultures grewMycobacterium fortuitum. Granulomatous lobular mastitis is a rare inflammatory disease of the breast. The definitive diagnose entails a biopsy. Other causes of chronic or granulomatous mastitis should be ruled out, including atypical or rare bacteria such asMycobacterium fortuitum. This is the first reported case of granulomatous mastitis secondary toMycobacterium fortuitum. With pathologic confirmation of granulomatous mastitis, an infectious etiology must be ruled out. Atypical bacteria such asMycobacterium fortuitummay not readily grow on cultures, as with our case. Medical management is appropriate, with surgical excision reserved for refractory cases or for drainage of abscesses.
authors.affiliation: Armin Kamyab, Department of Surgery, Cox Monett Hospital, Monett, MO 65708, United States.
authors.forename: Armin
authors.initials: A
authors.lastname: Kamyab
keywords: Breast; Breast mass; Granulomatous; Lobular; Mastitis; Mycobacterium fortuitum