Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . The retrocardiac space is suboptimally assessed with streaky opacity noted posterior to the heart on the lateral view likely representing atelectasis and / or scarring . No convincing evidence for pneumonia , edema , effusion or pneumothorax . The heart appears enlarged which likely in part reflect AP technique . Mediastinal contour appears normal . Bony structures are intact .
    OUTPUT:
    
Retrocardiac streaky opacity likely atelectasis . Top - normal heart size .