Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-erect single portable chest radiograph demonstrates stable moderate cardiomegaly . Mediastinal contours are otherwise unremarkable . Hila appear somewhat enlarged possibly due to vessel engorgment , but perception of asymmetric increase of the right hilus is largely due to patient rotation . There is a significant elevation of the right hemidiaphragm , unchanged compared to ___ with associated atelectasis . Minimal atelectasis is also noted on the left . There is diffuse slightly prominent interstitium which is likely due to chronic lung changes . No pneumothorax identified . Likely small left pleural effusion .
    OUTPUT:
    
Stable moderate cardiomegaly . Small left pleural effusion . Background prominence of interstitium is likely due to chronic interstitial lung changes . Stable right hemidiaphragm elevation .