Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lung opacity is partly explained by mild chronically elevated hemidiaphragm as shown on the preop x-ray of ___ . This is accompanied by basal atelectasis and small - to - moderate pleural effusion and is unchanged since ___ , but improved since ___ . Pulmonary edema is small in this patient with prior sternotomy and moderate cardiac enlargement . Right - sided PICC line ends in lower SVC . There is no pneumothorax .
    OUTPUT:
    
There is no significant change since prior exam . 1 . Pulmonary edema is mild . 2 . Residual left pleural effusion is small to moderate .