title: True and false avascular areas in carotid angiography.
abstract: The cause of avascular areas in carotid angiograms is discussed in an effort to facilitate their correct interpretation. True avascular areas are due to extracerebral haematomas. False avascular areas are due to anatomical or technical factors, which can, to some extent, be eliminated.
mesh_terms: D002339:Carotid Arteries / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography / Q000379:methods; D003287:Contrast Media; D006259:Craniocerebral Trauma / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005188:False Negative Reactions; D006407:Hematoma, Epidural, Cranial / Q000000981:diagnostic imaging*; D006408:Hematoma, Subdural / Q000000981:diagnostic imaging*; D006801:Humans
chemical_list: D003287:Contrast Media