PA film demonstrates opacification within the left mid to upper zones which partially obscures the left heart border consistent with left upper lobe consolidation, particularly involving the lingular segments. There is hazy opacity in the right lower zone medially and the right heart border is not visualised. This could be misinterpreted as an additional right middle lobe consolidation, however this is in fact due to a pectus excavatum deformity, which is suggested by the orientation of the ribs and is confirmed on the lateral film.