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/59c72e56-3fd0-4edc-84da-7064a6bf4fbf-465 defines codes, but no codes are represented here