Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been slight interval decrease in size of the left pleural effusion , now moderate to large , with associated compressive left basilar atelectasis . No pneumothorax is detected . The cardiac and mediastinal contours are unchanged . Right lung remains clear . No pulmonary edema is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
Slight interval decrease in size of the left pleural effusion , now moderate to large with associated compressive left basilar atelectasis . No pneumothorax is identified .