This patient has pneumonia. What lobe or lobes are involved?
There is consolidation within the left upper lobe. While it is tempting to also say that there is right middle lobe pneumonia, the hazy opacity in the right lower zone medially and absence of the right heart border is actually due to pectus excavatum rather than consolidation. This is confirmed on the lateral image.
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.