三、周围肺动脉狭窄自肺动脉瓣以后的肺动脉管道狭窄可发生于从主干至肺内动脉的各段，单发或多发，大多伴有其他畸形如肺动脉瓣狭窄，室间隔缺损、法洛四联症及主动脉瓣上狭窄（supravalvularaorticstenosis）等。
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