2.3 Radiological imaging’s evaluation
High-resolution CT(HRCT) scans of all children were evaluated for the presence and distribution of the following findings: air-space consolidation, ground glass attenuation, crazy-paving pattern, and Poorly defined centrilobular nodules.14-17 Two investigators independently reviewed the HRCT images, and discrepancies on these findings were discussed by consensus. Criteria for these findings were checked in each patient(Figure 1). Crazy-paving pattern was defined as patchy well-defined areas of ground-glass opacity with superimposed septal thickening.