• Carlos Moreno-Vílchez, Clàudia Llobera-Ris, Rosa María Penin, María Jesús Pla, Francesca Mitjavila, and Joaquim Marcoval.
• Servicio de Dermatología, Hospital Universitari de Bellvitge, IDIBELL, Universidad de Barcelona, Hospitalet de Llobregat, Barcelona, España. Electronic address: cmorenov@bellvitgehospital.cat.
• Med Clin (Barc). 2022 Mar 11; 158 (5): 229-232.

BackgroundGranulomatous mastitis (GM) is defined by the formation of granulomatous inflammation in breast tissue. Erythema nodosum (EN) is a reactive inflammatory panniculitis characterized by erythematous subcutaneous nodules in the lower limbs. The association of GM with EN has been rarely reported. Our aim was to retrospectively review our series of patients with GM to better characterize their features and their association with EN.MethodsCases histologically diagnosed as granulomatous inflammation in breast tissue between 1995 and 2020 were retrospectively reviewed.ResultsForty-two women were diagnosed with GM. The average age at diagnosis was 41.619years, and 59.5% were of South-American ethnicity. EN was associated with GM in 11.9% of the patients. Patients with EN were diagnosed earlier than isolated GM (0.4months vs 6.81months; P<.05). Ulceration in the GM was more prevalent in patients with associated EN (60% vs 14.7%; P<.05).ConclusionEN in patients with GM may reduce the evolution time and may help to diagnose this rare condition that mimics breast carcinoma.Copyright © 2021 Elsevier España, S.L.U. All rights reserved.

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