Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient remains intubated . An orogastric tube passes into the stomach and crosses into the right lower quadrant . It probably terminates in the distal antrum . The lung volumes are low . The cardiac , mediastinal and hilar contours appear unchanged . There is a patchy retrocardiac opacity with air bronchograms , somewhat improved , and veil - like opacity , potentially a small left - sided pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Left basilar opacity and possible effusion , similar to somewhat improved . Pneumonia is difficult to exclude , although the location of opacity and circumstances are typical for atelectasis .