Fig. 3

Chest CTs of four groups of clustered cases. Cluster case 1: CT of a 38-year-old mother and her 2-year-old son. The lung markings are clear and focal and patchy opacities are seen in the apical and posterior segments of the right upper lobe (1A). Patchy opacities are seen in the upper lobes of both lungs, with blurred margins (1B). Cluster case 2: CT of a 38-year-old mother and her 4-year-old daughter. There are increased bronchovascular shadows in the right lung, with bronchial wall thickening and peribronchial consolidation in the right lower lobe (2A). There are increased bronchovascular shadows in both lungs, with heterogeneous attenuation and multiple areas of bronchial wall thickening. Small nodular and patchy opacities are seen along the bronchovascular bundles (2B). Cluster case 3: CT of a 34-year-old mother and her 5-year-old daughter. Patchy and nodular high-density shadows are seen in the lower lobe of the right lung (3A). Increased bronchovascular shadows are seen in both lungs, with bronchial wall thickening, left lower lobe consolidation and patchy opacities (3B). Cluster case 4: CT of a 46-year-old mother and her 7-year-old daughter. Multiple nodular and patchy opacities are seen in the right lower lobe (4A). Increased bronchovascular shadows are seen in both lungs, with bronchial wall thickening and multiple patchy opacities around the bronchi, more prominent in the right lung (4B)