title: Anomalous course of the intracranial internal carotid artery into the orbit: case report.
abstract: In this report, a case of anomalous internal carotid artery looping into the orbital apex is presented. The patient was a 41-year-old man with sudden onset headache, suggestive of aneurysmal subarachnoid hemorrhage (SAH). Imaging with CT demonstrated a perimesencephalic distribution of blood. Cerebral angiography confirmed non-aneurysmal, perimesencephalic SAH, but incidentally noted an anomalous left internal carotid artery with a course into the orbital cone. This is the only known example of this anatomic variation. Potential embryological explanations are discussed.
authors: Department of Neurosurgery, Emory University, Atlanta, Georgia, USA. spirosblackburn@gmail.com
authors: Spiros L
authors: SL
authors: Blackburn
authors: Mark
authors: M
authors: Dannenbaum
authors: Albert J
authors: AJ
authors: Schuette
authors: Jacques
authors: J
authors: Dion
mesh_terms: D000328:Adult; D002343:Carotid Artery, Internal / Q000002:abnormalities* / Q000000981:diagnostic imaging*; D002533:Cerebral Angiography; D004172:Diplopia / Q000209:etiology; D006261:Headache / Q000209:etiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D018810:Magnetic Resonance Angiography; D008297:Male; D009915:Orbit / Q000002:abnormalities*; D013345:Subarachnoid Hemorrhage / Q000150:complications / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014794:Visual Fields