title: Posterior fossa decompression with tonsillectomy in 104 cases of basilar impression, Chiari malformation and/or syringomyelia.
abstract: The prime objective in the surgical treatment of basilar impression (BI), Chiari malformation (CM) and/or syringomyelia (SM) is based on the restoration of the normal cerebrospinal fluid (CSF) dynamics at the craniovertebral junction through the creation of a large artificial cisterna magna. A small suboccipital craniectomy has been emphasized to avoid caudal migration of the hindbrain structures into the vertebral canal. Nevertheless, the results showed downward migration of the hindbrain related to that type of craniectomy. The authors present, otherwise, the results of 104 cases of BI, CM and/or SM, whose surgical treatment was characterized by a large craniectomy with the patient in the sitting position, tonsillectomy, large opening of the fourth ventricle and duraplasty with creation of a large artificial cisterna magna. A significant upward migration of the posterior fossa structures was detected by postoperative magnetic resonance imaging.
authors: Neurosurgical Division of Hospital Unimed, João Pessoa PB, Brazil. jags1803@hotmail.com
authors: José Alberto Gonçalves
authors: JA
authors: da Silva
authors: Adailton Arcanjo
authors: AA
authors: dos Santos
authors: Luiz Ricardo Santiago
authors: LR
authors: Melo
authors: Antônio Fernandes
authors: AF
authors: de Araújo
authors: Giseuda Pessoa
authors: GP
authors: Regueira
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001139:Arnold-Chiari Malformation / Q000601:surgery*; D003399:Craniotomy; D019299:Decompression, Surgical / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D010985:Platybasia / Q000601:surgery*; D012189:Retrospective Studies; D013595:Syringomyelia / Q000601:surgery*; D014068:Tonsillectomy / Q000379:methods*; D016896:Treatment Outcome; D055815:Young Adult