CXR-
1) Unilateral transradiancy (due to reduced lung perfusion)
Size and no. of mid lung and peripheral vessels are reduced on affected side
2) Contralateral plethoric lung (due to increased blood flow)
3) Small hilum on involved side (but lung volume is normal or only slightly decreased)
4) mediastinum- may show some shift to affected side
5) Ipsilateral air trapping- key finding
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