Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The heart is moderately enlarged . Lung volumes are low with no overt signs of pneumonia , edema , effusion or pneumothorax . Bony structures are intact .
    OUTPUT:
    
Cardiomegaly without definite signs of pneumonia or edema . Please note evaluation limited due to low lung volumes .