title: False positive dynamic imaging of the cerebral circulation due to a congenital anomaly.
abstract: False positive dynamic imaging of the cerebral circulation simulating vascular occlusive disease resulted from a clinically insignificant congenital variation in several patients at our institutions. The anomaly consisted of the asymmetrical caliber of the internal carotid and proximal anterior cerebral arteries. The 1 mm difference in the diameter of the internal carotid arteries was sufficient to be appreciated on dynamic imaging. The frequency of this anomaly was found to be 5% in a series of 200 bilateral carotid angiograms.
mesh_terms: D000328:Adult; D001157:Arterial Occlusive Diseases / Q000000981:diagnostic imaging*; D001921:Brain / Q000002:abnormalities / Q000098:blood supply / Q000000981:diagnostic imaging*; D002343:Carotid Artery, Internal; D002533:Cerebral Angiography; D002536:Cerebral Arteries; D002560:Cerebrovascular Circulation; D005189:False Positive Reactions; D006801:Humans; D008297:Male; D011877:Radionuclide Imaging; D012039:Regional Blood Flow; D012640:Seizures / Q000000981:diagnostic imaging / Q000209:etiology; D013670:Sodium Pertechnetate Tc 99m; D013667:Technetium
chemical_list: D013667:Technetium; D013670:Sodium Pertechnetate Tc 99m