This is the ValueSet that contains all the codes in Radiology Report Types (http://hl7.eu/fhir/imaging-r5/ValueSet/ImImagingReportTypesEuVS) and Radiology Report Types (http://hl7.eu/fhir/imaging-r5/ValueSet/ImImagingReportTypesEuVS). E.g. what you have to deal with if you get resources containing codes in either of them