Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New left retrocardiac opacity , consider an infiltrate . Rounded medial retrocardiac opacity , may represent distended mild esophageal hiatal hernia , better seen on CT ___ . Stable mild left costophrenic angle , opacity . Improved right basilar opacity . Mildly prominent interstitial markings , similar . Heart size upper limits are normal . Trace right pleural effusion , new or better seen . Aortic calcification .
    OUTPUT:
    
New left basilar opacity , consider infiltrate . . Trace right pleural effusion . Stable interstitial markings , edema or inflammatory .