Fig. 38

Centrilobular emphysema. HRCT shows centrilobular areas of radiolucency with no discernible walls in most of the cases (except in those areas where there is thickening of the interlobular septae) and with the presence of a central white dot (at the centre of the radiolucencies) representing the centrilobular artery (white arrows). Centrilobular emphysema mimics occasionally interstitial diseases that present with a “true cystic pattern”