Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , the opacification of most the left hemithorax is unchanged with associated slight leftward shift of the mediastinum , corresponding to mucous plug and associated collapse of the left lower lung . The visualized aerated left upper lung is overall unchanged . An underlying left pleural effusion can not be excluded . The appearance of the right hemithorax is overall unchanged . Hazy opacification of the right hemithorax in a semi-upright film , suggestive of a layering right pleural effusion . No pulmonary edema , focal consolidation to suggest pneumonia , or pneumothorax . No change in the position of the ETT tube , NG tube , and right PICC line .
    OUTPUT:
    
1 . Persistent left lower lung collapse , probably from mucous plug , stable since ___ . 2 . Probable bilateral pleural effusions , unchanged since ___ . 3 . No definite pneumonia .