Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Compared to the most recent prior study of ___ , the moderate left pleural effusion has significantly decreased and only a small residual pleural effusion in the posterior costophrenic sulcus remains . The previously noted left lower lobe atelectasis has completely resolved . The lungs are clear , and the cardiac and mediastinal contours are normal .
    OUTPUT:
    
Significant decreased small left pleural effusion . Resolved left lower lobe atelectasis .