Incidence of basilar invagination in patients with tonsillar herniation ? a case control craniometrical study

Arquivos de Neuro-Psiquiatria

Andrei F Joaquim¹  Yvens Barbosa Fernandes¹  Roger N Mathias¹  Ulysses C Batista¹  Enrico Ghizoni¹  Helder Tedeschi¹  Alpesh A Patel¹ 

关键词: basilar invagination;    tonsillar herniation;    craniometrical evaluation;    invaginação basilar;    heriação tonsilar;    avaliação craniometrical;   

DOI  :  10.1590/0004-282X20140113

来源: SciELO

【 摘 要 】

A retrospective case-control study based on craniometrical evaluation was performed to evaluate the incidence of basilar invagination (BI). Patients with symptomatic tonsillar herniation treated surgically had craniometrical parameters evaluated based on CT scan reconstructions before surgery. BI was diagnosed when the tip of the odontoid trespassed the Chamberlain’s line in three different thresholds found in the literature: 2, 5 or 6.6 mm. In the surgical group (SU), the mean distance of the tip of the odontoid process above the Chamberlain’s line was 12 mm versus 1.2 mm in the control (CO) group (p<0.0001). The number of patients with BI according to the threshold used (2, 5 or 6.6 mm) in the SU group was respectively 19 (95%), 16 (80%) and 15 (75%) and in the CO group it was 15 (37%), 4 (10%) and 2 (5%).

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