Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to prior study , there is new medial right basilar and left basilar retrocardiac opacity . Given the clinical history , this is concerning for aspiration , possibly developing pneumonia . There is no associated effusion , pneumothorax or apparent pneumomediastinum . The upper lungs remain well aerated . Hilar and cardiomediastinal contours are unchanged , with marked calcification and tortuosity of the thoracic aorta . Degenerative changes are noted in the thoracic spine . No free air is seen in the included upper abdomen .
    OUTPUT:
    
New bibasilar opacities , which given the clinical history are suspicious for aspiration , possibly developing pneumonia .