CT chest, scout image.There is leftward shift of the cardiomediastinal silhouette (red arrow) with hyperinflation of the right lung; no evidence of left lobe collapse. The left hemithorax is asymmetrically smaller when compared to the right (black arrow). There is central left-sided bronchiectasis with opacification of the left lower lung field. Incidental note is made of a right-sided aortic arch (blue arrow). 