Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Overlying EKG leads are present . The heart is markedly enlarged . There is a retrocardiac opacity unchanged likely a hiatal hernia . There is no convincing evidence for edema or pneumonia . No large effusion or pneumothorax is seen . The mediastinal contour appears grossly unremarkable . No acute bony abnormalities . Chronic right rib cage deformities noted .
    OUTPUT:
    
1 . Marked cardiomegaly without signs of edema or pneumonia . 2 . Hiatal hernia again seen .