Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette and hilar contours are normal . Again appreciated is a moderate - to - large left pleural effusion which is relatively unchanged compared to ___ despite thoracentesis on ___ . There is expected associated compressive atelectasis . The left lung apex and right lung is clear . There is no pneumothorax . Colonic interposition between the right hemidiaphragm and liver is noted and should not be mistaken for pneumoperitoneum .
    OUTPUT:
    
Persistent moderate - to - large left pleural effusion with associated atelectasis despite thoracentesis one day earlier . Results were discussed over the telephone with Dr . ___ at 2 : 17 p .m . by Dr . ___ on ___ at the time of initial review .