Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest provided . The heart remains mildly enlarged . There is limited evaluation due to low lung volumes . Subtle left lower lung opacity is seen projecting behind the heart , which could represent early pneumonia . A lateral view would be helpful to confirm . Otherwise , the lungs appear clear without evidence of effusion or pneumothorax . The mediastinal contour is stable . Bony structures are intact .
    OUTPUT:
    
Limited exam due to low lung volumes . Mild cardiomegaly is stable . Possible left lower lobe opacity which could represent pneumonia and correlation with lateral view would be helpful to confirm .