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Figure 1 CT scans in a 45 year old man with mild persistent bronchial asthma. (A) Inspiratory thin section CT scan showing diffuse bronchial wall thickening (arrows) and prominence of centrilobular structure (arrowheads, score 1) in the right lower lobe. (B) Expiratory thin section CT scan showing geographical air trapping (arrows, score 2) at the same level of the right lower lobe.
