Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low which accentuates the linear and interstitial opacities . An ill - defined opacity in the left lung in the third / fourth interspace has increased since the prior can be early pneumonia . No pneumothorax . Mild to moderate gastric and small bowel distension partially visualized .
    OUTPUT:
    
Possible small left upper lobe pneumonia . Persistent mild interstitial pulmonary abnormality , significance indeterminate .