The routine use of subtraction in aortic arch studies.

Abstract

Routine use of photographic subtraction in aortic arch or four-vessel studies can be valuable in uncovering unsuspected lesions and in cases in which clinical findings and unsubtracted radiographs are poorly correlated. Three cases are presented in which the correct diagnoses were made on subtraction prints but not on the unsubtracted radiographs. The technique is simple and can be used routinely in any radiology department.