A.阻塞近端蛛網(wǎng)膜下腔呈大杯口 B.阻塞近端蛛網(wǎng)膜下腔呈水平狀或鋸齒狀突然中斷 C.部分阻塞時,造影劑呈對稱分流 D.阻塞遠(yuǎn)端蛛網(wǎng)膜下腔逐漸正常 E.阻塞遠(yuǎn)端蛛網(wǎng)膜下腔呈水平狀中斷
A.診斷應(yīng)考慮:皮樣囊腫、膽脂瘤、蛛網(wǎng)膜囊腫等 B.囊壁有無鈣化對皮樣囊腫與蛛網(wǎng)膜囊腫的鑒別無幫助 C.占位效應(yīng)有助于皮樣囊腫與蛛網(wǎng)膜囊腫的鑒別 D.壁有無強化有助于皮樣囊腫與蛛網(wǎng)膜囊腫的鑒別 E.周圍有無水腫有助于皮樣囊腫與星形細(xì)胞瘤的鑒別
A.診斷應(yīng)考慮:膽脂瘤、膠質(zhì)瘤等 B.腦池室增寬應(yīng)首先考慮腦外病變 C.腦池增寬應(yīng)首先考慮膠質(zhì)瘤 D.腦池形態(tài)一致應(yīng)首先考慮聽神經(jīng)瘤 E.掃描病灶無強化不首先考慮聽神經(jīng)瘤