?:definition
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The presence of a piece lung tissue which is not attached to the pulmonary blood supply and does not communicate with the other lung tissue (not connected to the standard bronchial airways and not performing a function in respiration). [HPO:sdoelken]
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The presence of microscopic cystic masses of nonfunctioning pulmonary tissue that lack an obvious communication with the tracheobronchial tree. [HPO:probinson, PMID:20610189]
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