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在出生后需要完全通气功能之前,由于胎盘的气体交换使得气道完全阻塞的胎儿能够存活下来。作者提供了1例出生前超声扫描提示由于胸腔内肿瘤导致不能
Before full ventilation is required after birth, a fetus with a completely obstructed airway can survive due to the gas exchange of the placenta. The authors provided an example of prenatal ultrasound scans that could not be caused by a tumor in the chest