This is a case study presented by the University of Pittsburgh Department of Pathology in which an 80-year-old woman presents to the hospital with "a single, palpable, irregular mass in the left breast." Visitors are given the gross and microscopic descriptions, including images, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in gynecologic pathology