Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior CXR from ___ , there is slight interval improvement in the left lung base opacity , suggesting resolving effusion . Right lung is essentially clear . There is no evidence of pneumonia , pulmonary edema or pneumothorax . Cardiomediastinal silhouette is within normal limits . The right IJ and endotracheal tube are unchanged in position .
    OUTPUT:
    
Interval improvement in left pleural effusion . No evidence of pneumonia .