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Congenital cystic adenomatoid malformation classification based on presumed site of development of the malformation. 0 = tracheobronchial, 1 = bronchial/bronchiolar, 2 = bronchiolar, 3 = bronchiolar/alveolar, 4 5 distal acinar. Stocker JT, Fetal Pediatr Pathol. 2009;28:155–184, copyright © 2009, Informa Healthcare. Reproduced with permission from Informa Healthcare.9
