Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval improvement in the previously seen patchy right lower lobe opacities . A nipple shadow projects of the left mid lung and seems to overlap with a faint opacity probably corresponding to a ground glass opacity in the left lung also depicted on the prior CT . No pleural effusion or pneumothorax is seen . A right upper extremity PICC ends in the mid SVC . Cardiomediastinal and hilar contours are unremarkable , except for mild aortic calcifications .
    OUTPUT:
    
Patchy opacities , probably pneumonia , but improved .