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Fig. 2A. —11-year-old boy with pulmonary histiocytosis X. High-resolution CT scans of chest obtained with 34 mAs (A) (average image quality score, 4.07) and 180 mAs (B) (average image quality score, 4.01) show widespread thin-walled, air-filled cysts (arrows). Fissures appear sharper in B than in A.