Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size and cardiomediastinal contours are normal . Interstitial markings have slightly improved since the prior exam , but right lower lobe opacity now silhouettes the right hemidiaphragm . No substantial pleural effusion or pneumothorax .
    OUTPUT:
    
Slight interval improvement of interstitial markings . Increased right lower lobe opacity consistent with aspiration or atelectasis .