A healthy woman in her 40s, lactating, 5 months post partum, presented with a 1-month history of enlargement and induration of both breasts (Figure, A). A skin biopsy specimen from the breast was obtained (Figure, B). She was initially diagnosed with mastitis and received several courses of antibiotics for 2 months without improvement. Subsequently she presented with back pain, paresthesias, shooting pain in the mandibular region, and diplopia. All of these conditions improved under treatment with oral corticosteroids, but the breast enlargement continued. Laboratory test results highlighted a hemoglobin level of 7.6 g/dL and a platelet count of 80 000/μL. (To convert hemoglobin to grams per liter, multiply by 10; to convert platelets to number of cells × 109/L, multiply by 1.0.)
Solano-López G, Concha-Garzón MJ, Sánchez-Pérez J. Indurated Breast During Lactation. JAMA Dermatol. 2015;151(2):223–224. doi:10.1001/jamadermatol.2014.2821
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