Mabel Ryder, M.D., is an endocrinologist at Mayo Clinic Comprehensive Cancer Center in Rochester, Minnesota. Dr. Ryder treats endocrine cancers including thyroid cancer, adrenal cancer, pituitary tumors, paraganglioma, Hurthle cell cancer, parathyroid cancer and neuroendocrine tumors. She is an expert in the treatment and management of thyroid diseases and thyroid function. Mayo Clinic is top-ranked in more specialties than any other hospital, according to U.S. News & World Report, and the Cancer Center continually ranks among the top hospitals in the U.S. for Cancer. Mayo Clinic Comprehensive Cancer Center is a National Cancer Institute (NCI)-designated comprehensive cancer center.