Know the headline shocks the conscience a bit. But what is a rad onc? What do those in this "increasingly popular specialty" do? If a rad onc is a "physician who uses ionizing radiation (such as megavoltage X-rays or radionuclides) in the treatment of cancer," you absolutely do not have to do a rad onc residency to be a radiation oncologist. (But, hey ASTRO, real nice work on Urorads. You did great.) Now derms do more rad onc in the US than board certified rad oncs do. A 4 year rad onc residency is a "bad buy" if any other MD can do what we do without all the hassle of said rad onc residency.