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Figure 1: Representative unenhanced transverse CT scan of midlung zones in 16-year-old boy shows severe interstitial changes. Note the presence of ground-glass opacities and the intermixed thickened interlobular septa and intralobular lines in some areas; these findings are suggestive of the "crazy paving" sign. Results of pulmonary function testing were normal, which demonstrates that the radiographic findings do not always correspond to the clinical state.
