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Figure 13b.  Type I congenital cystic adenomatoid malformation. (a) Anteroposterior chest radiograph of a 5-year-old child shows a bubbly mass in the left upper lobe with a dominant air cyst morre than 4 cm in diameter (arrows). (b) CT scan of the same patient shows a hypoattenuating, clearly delineated cystic mass (*) in the left upper lobe.