bud

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BPS has been postulated to occur due to the formation of an accessory lung bud inferior to the normal lung buds that develop from the primitive foregut as it migrates caudally.
4) During normal lung development, the primary lung bud receives a vascular plexus from the dorsal aorta which regresses with the development of the main pulmonary artery.
The most widely accepted theory is that it results from formation of an accessory lung bud inferior to the normal lung buds during development.