Dr. Peder Horner is an interventional radiologist with Diversified Radiology of Colorado.  He completed medical school at University of Kansas, Kansas City, Missouri; then went on to complete his diagnostic radiology residency at Oregon Health and Science University in Portland, Oregon.  He completed his fellowship in vascular and interventional radiology at Oregon Health and Science University as well. Dr. Horner and his interventional radiology colleagues are key members of the extremity tumor service line. Their expertise in biopsy and intra-arterial chemotherapy is imperative in the post-treatment outcomes for osteosarcoma.