Objective : To explore the application value and relevant scope of MSCT scanning for airway foreign bodies in children. Methods : 76 children with suspected airway foreign bodies were examined by spiral CT scan with reconstruction in review. The sensitivity and specificity of spiral CT imaging were assessed and its applications scope was summarized in all cases with the results of endoscopy or operation as the gold standard. Results: 68 cases of foreign bodies were diagnosed by the endoscopic and surgical procedures,no foreign body was found in 8 cases,including granuloma in 3 cases and inflammatory stenosis in 2 cases. 72 patients (6 false-positive) of airway foreign bodies were diagnosed by spiral CT;no foreign body was found with CT in 4 cases (2 false negative). The sensitivity and accuracy of spiral CT in the diagnosis of airway foreign bodies were 94.3％ (66/70) ,and 85.9 ％ (66/76) , respectively. Conclusion: The spiral CT is a very useful diagnostic fool with high sensitivity and accuracy,and can display the positions of foreign bodies as well as complications. If is the first choice of non-invasive examination for children with airway foreign bodies. To reduce unnecessary examines,it should be used within a certain scope.%目的:探讨螺旋CT扫描在小儿气道异物诊治中的应用价值及适用范围.方法:对76例可疑气道异物的患儿行螺旋CT扫描及图象重建,以内窥镜或手术结果为金标准,评估MSCT检查的敏感度、特异度,总结其适用范围.结果:经内窥镜及手术确诊气道异物68例,未见异物8例,其中3例为肉芽肿,2例炎性狭窄;螺旋CT诊断气道异物72例(6例假阳性),未见异物4例(2例假阴性).螺旋CT对气道异物诊断的敏感度为94.3%(66/70),准确率为85.9%(66/76).结论:螺旋CT扫描对小儿气道异物的诊断敏感度及准确度高,定位准确,可显示各种合并症,是无创非侵入性检查的首选方法.但应适用于一定范围内,以减少不必要的检查.
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