title: Riles type 1A common carotid artery occlusion diagnosed by specific external carotid artery Doppler waveform pattern in carotid ultrasonography. Case report.
abstract: A 67-year-old man was admitted for evaluation of left homonymous hemianopsia. Carotid ultrasonography showed that the right common carotid artery (CCA) was occluded up to just proximal to the carotid bifurcation, and the patent external carotid artery showed retrograde flow to the patent internal carotid artery via the carotid bifurcation. The Doppler waveform pattern of the external carotid artery showed high end-diastolic flow velocity and low pulsatility index. The diagnosis was Riles type 1A CCA occlusion. Digital subtraction angiography and iodine-123 N-isopropyl-p-iodoamphetamine single photon emission computed tomography were performed to confirm the collateral circulation and adequate intracranial hemodynamic sufficiency. Nonsurgical treatment with antiplatelet therapy was performed for the CCA occlusion. No stroke events have occurred within the 2-year follow-up period.
authors.affiliation: Department of Neurosurgery, Graduate School of Medicine, Osaka City University, Osaka, Japan. uda@med.osaka-cu.ac.jp
authors.forename: Takehiro
authors.initials: T
authors.lastname: Uda
authors.forename: Keiji
authors.initials: K
authors.lastname: Murata
authors.forename: Masakazu
authors.initials: M
authors.lastname: Sakaguchi
authors.forename: Keishi
authors.initials: K
authors.lastname: Yamagata
authors.forename: Kenji
authors.initials: K
authors.lastname: Ohata
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging* / Q000473:pathology; D002342:Carotid Artery, External / Q000000981:diagnostic imaging*; D016893:Carotid Stenosis / Q000145:classification / Q000000981:diagnostic imaging* / Q000188:drug therapy / Q000473:pathology; D006423:Hemianopsia / Q000209:etiology; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008297:Male; D010975:Platelet Aggregation Inhibitors / Q000627:therapeutic use; D016896:Treatment Outcome; D014463:Ultrasonography
chemical_list: D010975:Platelet Aggregation Inhibitors