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Fig. 3A. —15-year-old girl without asthma (group C). Subject underwent high-resolution CT (HRCT) for investigation of pneumothorax. HRCT scans obtained at three predefined levels and corresponding schematic diagrams show sections of bronchi (arrow, B). One section of bronchial wall thickening was detected at first level (A), six sections were seen at second level (C), and one section was depicted at third level (E). Therefore, bronchial wall thickening score for this patient was 8 (1 + 6 + 1 = 8).