内リンパ嚢手術所見とＣＴ所見の比較

Abstract

In 38 patients with Meniere's disease (29 unilateral and 9 bilateral) treated with surgical drainage of the endolymphatic sac (ELS) between 1986-1991, the surgical findings and temporal bone CT findings were correlated. At surgery the position and size of the ELS were recorded. The position of the ELS was classified into 3 types according to Arenberg's parameters (type I, type II and type III) and the size of the ELS was large, intermediate or small. CT scans encompassing the lateral semicircular canal were used to measure the minimum distance between the posterior semicircular canal and the posterior petrous surface (P-P distance). The P-P distance in 23 type III position ELSs was significantly shorter (2.25 mm) than that in 15 type I or type II position ELSs (3.29 mm). The P-P distance of the 9 large ELS was significantly longer (3.99 mm) than that of the 20 intermediate size ELSs (2.40 mm) and of the 9 small ELSs (1.92 mm). Significant correlations were found in Meniere's patients between the short P-P distance and the type III position, and between the short P-P distance and intermediate or small size ELSs.