Lymphocytic Mastopathy – A Rare Entity and A Diagnostic Challenge

Lymphocytic mastopathy is a benign rare entity, commonly associated with long standing diabetes. It has also rarely been reported on patients with autoimmune diseases, particularly Sjogren’s syndrome. There are very few cases reported, with the literature suggesting an incidence of <1% of benign breast diseases. Despite being considered a benign disease, lymphocytic mastopathy presents similarly to breast cancer on imaging, posing a diagnostic challenge. This report describes a case of a postmenopausal woman with significant autoimmune history that presented with a right-sided breast lump found to have lymphocytic mastopathy on histology.