Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A G - tube is seen projecting over the left upper quadrant . Normal heart size . New poorly defined opacities have developed in the left perihilar region . . No pleural effusion or pneumothorax . Left retrocardiac opacification has decreased in extent compared to ___ , and a small left pleural effusion has resolved .
    OUTPUT:
    
New left perihilar opacity , which could reflect aspiration or developing infectious pneumonia . Short - term followup radiographs may be helpful in this regard . Improved left retrocardiac opacity and apparent resolution of small left pleural effusion .