Breast arteritis in polymyalgia rheumatica

A 79-year-old woman with the clinical presentation of polymyalgia rheumatica (PMR) also had breast cancer. Histopathologic evidence of arteritis was found in mastectomy tissue and in a temporal artery, neither of which had produced symptoms before surgery. Previously reported cases are reviewed in the context that breast vasculitis may be more common than in generally recognized in patients with PMR.