Arachnoid cyst of the lateral ventricle manifesting positional psychosis.
A 30-year-old woman had an arachnoid cyst in the trigone of the right lateral ventricle 5 years before she developed episodic auditory and visual hallucinations as well as delusions of persecution. The psychotic episodes tended to occur after the patient had lain in bed for 1 to 2 hours. After craniotomy and wide excision of the cystic membrane, draining the cystic fluid to the lateral ventricle, the psychotic episodes subsided in a follow-up period of 6 months. We believe that when the patient was recumbent, the trigone cyst blocked the temporal horn further, caused local ischemia, and triggered the psychosis, which was a form of partial complex psychomotor seizure.
Division of Neurosurgery, Chang Gung Memorial Hospital, Taipei, Taiwan, Republic of China.
C W
CW
Wong
S F
SF
Ko
Y Y
YY
Wai
D000328:Adult; D016080:Arachnoid Cysts / Q000503:physiopathology* / Q000601:surgery; D002552:Cerebral Ventricles / Q000503:physiopathology / Q000601:surgery; D003399:Craniotomy; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D019965:Neurocognitive Disorders / Q000503:physiopathology* / Q000601:surgery; D009949:Orientation / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D014057:Tomography, X-Ray Computed