title: Dissecting Aneurysm of Anterior Inferior Cerebellar Artery Initially Presenting with Nonhemorrhagic Symptom.
abstract: We report a patient with a probable dissecting aneurysm of the anterior inferior cerebellar artery (AICA) initially presenting with a nonhemorrhagic symptom, which resulted in subarachnoid hemorrhage. A 61-year-old woman suddenly experienced nausea. Computed tomography (CT) on admission showed a high-density mass with a double lumen in the right cerebellopontine angle without subarachnoid hemorrhage. Five days after the onset, she suddenly lost consciousness. CT demonstrated subarachnoid hemorrhage. Emergency angiography revealed a probable dissecting aneurysm at the lateral pontomedullary segment of the right AICA. Although the initial symptom is not hemorrhage, an unruptured dissecting aneurysm of the AICA may have a high risk of rupture. Immediate radical treatment to prevent subsequent rupture is necessary for even an unruptured dissecting aneurysm of the AICA.
authors.affiliation: Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan.
authors.forename: Jo
authors.initials: J
authors.lastname: Sasame
authors.affiliation: Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Yokohama, Japan. Electronic address: nomura413jp@yahoo.co.jp.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nomura
mesh_terms: D000784:Aortic Dissection / Q000150:complications / Q000175:diagnosis / Q000601:surgery; D002531:Cerebellum / Q000098:blood supply*; D038524:Diffusion Magnetic Resonance Imaging; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications / Q000175:diagnosis / Q000601:surgery; D018810:Magnetic Resonance Angiography; D008875:Middle Aged; D015898:Tomography Scanners, X-Ray Computed; D014656:Vascular Surgical Procedures
keywords: Anterior inferior cerebellar artery; dissecting aneurysm; rupture; subarachnoid hemorrhage