He specializes in neuroradiology, diagnostic radiology and head and neck imaging.Dr. Aygun received his M.D. from the Hacettepe University School of Medicine in Ankara, Turkey. He performed residencies in radiology at Hacettepe University Hospitals and Case Western Reserve University in Cleveland, Ohio. He completed a fellowship in neuroradiology at the Cleveland Clinic Foundation, where he subsequently acted as staff neuroradiologist before joining the Johns Hopkins faculty in 2002.