This is the CodeSystem that contains codes in both RadLex radiology lexicon (http://radlex.org) and RadLex radiology lexicon (http://radlex.org).
This code system http://hl7.org/fhir/comparison/CodeSystem/b9af8e40-c632-44bd-9daa-82642c2bb7e7-465 defines codes, but no codes are represented here