Treatment of Idiopathic Granulomatous Mastitis: Combined Intralesional Steroid Injection with Topical Steroid Administration vs. Systemic (Oral) Steroid
Abstract BackgroundIdiopathic granulomatous mastitis (IGM)is characterized by non-caseating granuloma and microabscess formation limited to mammary gland lobules. It is a form of chronic mastitis of unknown pathogenesis. In this study, we aimed to compare the effectiveness of intralesional steroid injection with topical steroids versus systemic steroid therapy in the treatment of IGM. MethodsBetween June 2017 and December 2020, the patients were collected and assessed. IGM was diagnosed histopathologically by tru-cut biopsy in patients with breast mass, pain, and erythema with suspicion of IGM. Included in the study were one hundred and eleven patients who were diagnosed with IGMand who were treated with local or oral administration of corticosteroids, with at least 6 months of follow-up. The patients were divided into 2 groups: a local corticosteroid treatment group (LC, group 1, n=57); and a peroral corticosteroid treatment group (OC, group 2, n=54). Demographic characteristics, treatment responses, recurrence rates, side effects of the steroid, and the need for surgery were compared.ResultsWhile the rate of smoking was 12.3% in the LC group, was 20.4% in the OC group. There was no history of oral contraceptive use in either group of patients. Previous steroid use was significantly lower in the LC group (10.5%) compared to the OC group (55.6%) (p = 0.001). Previous antibiotic use was significantly lower in the LC group (75.4%) compared to the OC group (100%) (p = 0.001). When complete and partial responders were grouped as “responders,” 96.5% in the LC group and 75.9% in the OC group responded after the first course of treatment (p=0.001). 98.2% in the LC group and 87.0% in the OC group were complete responders after the third course of treatment (p=0.003). While 7% of the patients in the LC group had recurrence, 37% in the OC group had recurrence (p=0.001). Steroid-related side effects were lower in the LC group (no) compared to the OC group (11.1%) (p=0.010). Surgery was performed in 3.5% of the LC group, while surgery was performed in 57.3% of the OC group (p=0.001). ConclusionSteroid injection is an IGM treatment with proven efficacy, short response time, low recurrence rate, and lower need surgery. The treatment is easy to administer and minimizes the risk of systemic side effects. Even in clinically severe cases, we believe that steroid injection might be used as monotherapy, or in combination with other therapies, to improve treatment efficacy and create a transition to less aggressive treatments.
