title: Application of parasagittal surface coil MRI to otoneurological diagnosis.
abstract: Parasagittal surface coil magnetic resonance imaging (MRI) of the internal auditory canal and the inner ear was performed in patients with otoneurological diseases. T2-weighted fast spin-echo sequences, plain and enhanced T1-weighted sequences were used to examine the inner ear and the individual nerves in the internal auditory canal. Normal parasagittal images of the inner ear and the internal auditory canal and 4 patients with otoneurological disorders are presented. Precise location of the acoustic tumor was visualized and postoperative status of the internal auditory canal and the inner ear was assessed by the present method. The cochlear nerve was not identified in a patient with long-standing unilateral deafness. A follow-up study with MRI was performed in a patient with Meniere's disease who underwent endolymphatic-mastoid shunt surgery, showing gradual postoperative shrinkage of the shunted endolymphatic sac. The present method provides a new approach to the assessment of otoneurological disorders.
authors.affiliation: Department of Hearing and Speech Science, Graduate School of Medicine, Kyoto University, Japan. naito@ihouse.kuhp.kyoto-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Naito
authors.forename: M
authors.initials: M
authors.lastname: Miura
authors.forename: K
authors.initials: K
authors.lastname: Funabiki
authors.forename: E
authors.initials: E
authors.lastname: Naito
authors.forename: I
authors.initials: I
authors.lastname: Honjo
mesh_terms: D000293:Adolescent; D000328:Adult; D003056:Cochlear Nerve / Q000473:pathology; D007758:Ear, Inner / Q000473:pathology; D004712:Endolymphatic Sac / Q000473:pathology / Q000601:surgery; D005154:Facial Nerve / Q000033:anatomy & histology; D005260:Female; D005500:Follow-Up Studies; D034381:Hearing Loss / Q000175:diagnosis / Q000473:pathology; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000473:pathology; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007759:Labyrinth Diseases / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008416:Mastoid / Q000473:pathology / Q000601:surgery; D008575:Meniere Disease / Q000473:pathology / Q000601:surgery; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000175:diagnosis; D010579:Petrous Bone / Q000294:innervation / Q000473:pathology; D012665:Semicircular Canals / Q000033:anatomy & histology; D014725:Vestibular Nerve / Q000033:anatomy & histology; D000160:Vestibulocochlear Nerve Diseases / Q000175:diagnosis*