Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . 2 lead pacer is unchanged with leads extending to the region of the right atrium and right ventricle . Overlying EKG leads are present . Lung volumes are low . The heart remains mildly enlarged . The lungs appear clear . There is no convincing evidence for pneumonia . There is mild hilar congestion without frank edema . No pneumothorax . Bony structures are intact .
    OUTPUT:
    
Mild cardiomegaly with hilar congestion . Otherwise unremarkable .