text: 【病理解剖】在胚胎发育期，左侧第Ⅵ腮弓近端退化或发育不良，导致其与左肺连接中断，致使在右肺动脉橫部与左肺动脉间形成“侧支血管”，该血管跨越右主支气管转向左侧，在气管与食管之间进入左侧肺门，形成包绕右主支气管与气管下段的悬带，产生压迫症状，可伴有气管下段和右主支气管发育不良。
entities.entity: 左侧第Ⅵ腮弓
entities.label: bod
entities.entity: 左肺
entities.label: bod
entities.entity: 右肺动脉橫部
entities.label: bod
entities.entity: 左肺动脉
entities.label: bod
entities.entity: 血管
entities.label: bod
entities.entity: 右主支气管
entities.label: bod
entities.entity: 气管
entities.label: bod
entities.entity: 食管
entities.label: bod
entities.entity: 左侧肺门
entities.label: bod
entities.entity: 右主支气管
entities.label: bod
entities.entity: 气管下段的悬带
entities.label: bod
entities.entity: 压迫
entities.label: sym
entities.entity: 气管下段和右主支气管发育不良
entities.label: dis