由于存在着解剖上的差异，右下叶支气管异物较左侧的多。
Because of the anatomical difference, the foreign bodies usually saw in right lower lobar bronchus.
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.
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