title: [Comparative efficacy of multidirectional and computed tomography in the diagnosis of tumors of the pontocerebellar angle (author's transl)].
abstract: Extensive investigation of 41 patients highly suspected of having pontocerebellar angle tumors led to the detection of 21 surgically confirmed tumors. Precise criteria, involving numerical rating of sensitivity and specificity, were applied to compare the diagnostic reliability of multidirectional and computed tomography. An analysis of the diagnostic value of internal auditory canal anomalies demonstrated the obvious superiority of 3 mm as against 6 to 9 mm scanner sections, and the good correlation between the anomalies detected by these thin scanner sections and those obtained by tomography. Above all, however, the efficacy of thin scanner sections appears to be markedly superior to that of tomography, as 80 p.cent of tumors were visualized without false positives even when the internal auditory canal was normal. The number of cisternography examinations was thus considerably reduced. This efficacy of thin scanner sections varied as a function of the tumor size : all those of 2 cm diameter or more were detected by the scanner, 50 p.cent of those between 1 and 2 cm by both the scanner and tomography, the latter being more effective for detecting tumors less than 1 cm in diameter. The availability of the 4th generation scanner will markedly increase its effectiveness.
mesh_terms: D002528:Cerebellar Neoplasms / Q000000981:diagnostic imaging*; D002530:Cerebellopontine Angle; D005069:Evaluation Studies as Topic; D006801:Humans; D014056:Tomography, X-Ray / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*
vernacular_title: Comparaison de l'efficacité des tomographies pluridirectionnelles et de la tomodensitométrie dans le diagnostic des tumeurs de l'angle ponto-cérébelleux.