Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right subclavian line ends in the region of the cavoatrial junction . An enteric tube traverses the diaphragm and its tip is not seen . The retrocardiac opacity has since improved . No focal consolidation , pleural effusion , pulmonary edema , or pneumothorax . Stable slightly low lung volumes . Unchangedmoderate cardiomegaly .
    OUTPUT:
    
Slight interval improvement in retrocardiac opacity ; otherwise , no significant interval change including no pneumonia .