Shannon P. Fortin Ensign, M.D., Ph.D., is a hematologist and oncologist at Mayo Clinic Comprehensive Cancer Center in Phoenix, Arizona. Dr. Fortin Ensign treats brain tumors and brain metastases, including acoustic neuroma, astrocytoma, chordoma, craniopharyngioma, ependymoma, glioblastoma, glioma, leptomeningeal metastases, medulloblastoma, meningioma, neurofibroma, oligodendroglioma, peripheral nerve tumor, pituitary tumor, and primary CNS lymphoma and spinal cord tumor. She is an expert in intrathecal chemotherapy. Dr. Fortin Ensign is interested in advancing new treatments and personalized medicine for brain cancer. Mayo Clinic is the #1 hospital in Arizona, according to the 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.