Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to baseline there is a new right middle lobe opacity partially obscuring the inferior right cardiac margin . There is also an opacity in the right costophrenic angle with an associated small pleural effusion better seen in the lateral view . Linear atelectasis is seen in the right mid lung . Stable moderate - to - severe cardiomegaly . There is no pneumothorax . Sternotomy wires are intact .
    OUTPUT:
    
Right middle and right lower lobe opacities with associated pleural effusion may represent a combination of atelectasis and infection / aspiration in this patient with recent vomiting episodes .