Introduction. Whilst most consequences of diabetes mellitus are well recognized, breast-related complications remain obscure. The term diabetic mastopathy (DMP) attempts to describe the breast-related consequences of diabetes. Methods. We report the clinicopathologic findings in a patient with DMP and review the literature on this uncommon entity. Results. A 33-year-old woman with type 1 diabetes had excision biopsy of a 2 cm breast lump. Histopathologic evaluation revealed classic features of DMP: parenchymal fibrosis; keloid-like hyalinization of interlobular stroma; adipose tissue entrapment; lobular compression; dense chronic inflammatory cell infiltration; and lymphoid follicle formation. Conclusion. Clinicians should be aware of DMP as a differential for breast disease in women with uncontrolled diabetes.
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