Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large hiatal hernia is re- demonstrated . Cardiac and mediastinal silhouettes are grossly stable with the cardiac silhouette persistently enlarged . Since the prior study , there are new perihilar and upper lung opacities which could be due to pulmonary edema , but underlying infectious process is not excluded . No large pleural effusion is seen . There is no evidence of pneumothorax .
    OUTPUT:
    
Large hiatal hernia . New perihilar and upper lobe opacities , new since ___ , may be due to pulmonary edema , however , superimposed infection is not excluded .