Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube tip seats 4 .5 cm above the carina . A right - sided PICC tip terminates at the cavoatrial junction . An endogastric tube courses inferiorly and out of the field of view . An IVC filter is present . The heart size is within normal limits . The mediastinal and hilar contours appear normal . The lungs continue to demonstrate an ill - defined opacity behind the heart which does not appear to obscure the hemidiaphragm . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Lines and tubes in place as described above ; retrocardiac opacity is improving but persists .