title: Apparently asymptomatic arachnoid cyst: postoperative improvement of subtle neuropsychological impediment -case report-.
abstract: A 13-year-old right-handed boy sustained minor head trauma in a traffic accident. Computed tomography of the head showed no injuries, but revealed an arachnoid cyst in the left middle fossa. Single photon emission computed tomography revealed relatively decreased cerebral blood flow (CBF) in the left frontal and temporal lobes compared with the contralateral regions. The Wechsler Intelligence Scale for Children-Revised (WISC-R) test showed full scale intelligence quotient (IQ) was normal, but also a discrepancy between verbal IQ and performance IQ. Cyst-peritoneal shunting was performed. Postoperatively, laterality of the CBF in the frontal and temporal lobes was resolved and the verbal IQ/performance IQ discrepancy was normalized. In this case, although the WISC-R score was apparently within normal limits, latent regional ischemia induced by compression due to the arachnoid cyst may have caused neuropsychological dysfunction. CBF study and neuropsychological evaluation by the WISC-R may be useful for selecting patients with apparently asymptomatic arachnoid cysts for surgery.
authors.affiliation: Department of Neurosurgery, Ibaraki Prefectural Central Hospital, Ibaraki. matsuda@belle.shiga-med.ac.jp
authors.forename: Wakoto
authors.initials: W
authors.lastname: Matsuda
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Akutsu
authors.forename: Shinya
authors.initials: S
authors.lastname: Miyamoto
authors.forename: Shozo
authors.initials: S
authors.lastname: Noguchi
authors.forename: Takashi
authors.initials: T
authors.lastname: Tsunoda
authors.forename: Mamoru
authors.initials: M
authors.lastname: Sasaki
authors.forename: Akira
authors.initials: A
authors.lastname: Matsumura
mesh_terms: D000293:Adolescent; D016080:Arachnoid Cysts / Q000150:complications / Q000175:diagnosis* / Q000628:therapy; D002557:Cerebrospinal Fluid Shunts; D002560:Cerebrovascular Circulation; D003072:Cognition Disorders / Q000209:etiology* / Q000628:therapy; D019299:Decompression, Surgical / Q000379:methods; D005625:Frontal Lobe / Q000098:blood supply; D007839:Functional Laterality; D006801:Humans; D033162:Incidental Findings; D008297:Male; D009483:Neuropsychological Tests; D013702:Temporal Lobe / Q000098:blood supply; D015899:Tomography, Emission-Computed, Single-Photon; D016896:Treatment Outcome; D014888:Wechsler Scales