Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . ET and NG tubes have been removed . There is significant improvement in aeration of the lungs with resolved pulmonary edema . There is a small residual left pleural effusion and left lower lobe atelectasis . There is right perihilar opacity which could represent atelectasis , though pneumonia is difficult to exclude in the correct clinical setting . Heart size appears grossly stable . Mediastinal contour is unremarkable . Bony structures are intact .
    OUTPUT:
    
Significant interval improvement in aeration of the lungs with persistent right perihilar and left lower lobe opacity , likely atelectasis . Small residual left effusion .