结论：对右肺下叶底段支气管下部层面作CT扫描可以显示斜裂下部的影像；
Conclusion: The image of the inferior oblique fissure can be showed by the CT scan at the lower level of the basic lobe of right lung.
结果患儿均显示异物的直接征象，CT显示异物位于右肺主支气管12例，右中间支气管1例，右下叶支气管2例，左肺主支气管6例。
CT scan showed foreign body was located in right main bronchial 12 cases, right middle bronchial 1 case, right inferior lobar bronchial 2 cases and left main bronchial 6 cases.
右肺活检阳性率高于左肺，两下叶活检阳性率高于上叶；
The positive rate of inferior lung was higher than that of upper lung.
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