Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear unchanged . There is new patchy opacity involving the superior segment of the left lower lobe and probably also the left upper lobe to a lesser degree . Minimal streaky opacification also projects over the right upper lobe . These findings suggest pneumonia . There is no pleural effusion or pneumothorax . Bony structures appear within normal limits .
    OUTPUT:
    
Opacities suggesting pneumonia , particularly within the left lower lobe including retrocardiac opacification . Within eight weeks , following treatment , follow - up radiographs are suggested to show resolution .