Even in this time of uncertainty, Mayo Clinic is a place for hope and healing — and we're committed to delivering the care you need. With options for face-to-face, virtual visits or phone appointments in adherence with federal and state executive orders and guidance. Daniel J. Ma, M.D., is a radiation oncologist at Mayo Clinic's campus in Rochester, Minnesota. Dr. Ma's expertise and special interests include: head and neck cancer, laryngeal cancer, nasopharyngeal carcinoma, oral and throat cancer, salivary gland tumors, skull base tumors and thyroid cancer. In addition, Dr. Ma is a specialist in radiation treatment options, including IMRT, proton therapy, radiation therapy and stereotactic body radiotherapy. U.S. News & World Report consistently ranks Mayo Clinic among the top hospitals for cancer in the nation.