在左肺下叶支气管层面上，上段支气管发出。
On the section through left inferior lobar bronchus, superior segmenta1 bronchus appeared.
目的：为左肺下叶支气管的CT显示提供应用解剖学基础。
Objective:To provide the applied anatomic basis for CT demonstration in left 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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