Mary Freyvogel Ramirez, DO, FACOS Mary Freyvogel Ramirez, DO, FACOS, is a breast surgeon with AHN Surgery Institute, specializing in surgical management of benign and malignant breast disease. She has expertise in performing nipple-sparing mastectomy and oncoplastic procedures. She went to medical school at Lake Erie College of Osteopathic Medicine in Erie, Pennsylvania. Upon completing medical school, she did her residency at McLaren Macomb Hospital in Mt. Clemens, Michigan and her fellowship in breast surgery at the Cleveland Clinic Foundation in Cleveland, Ohio. Dr. Freyvogel Ramirez is certified by the American Board of Surgery and is also a Fellow of the American College of Osteopathic Surgeons. She sees patients ages 16 and older.