Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . Aortic knob is calcified . Mediastinal and hilar contours are unremarkable . Patchy ill - defined opacities in both lung bases are present . No pleural effusion or pneumothorax is demonstrated . There are multilevel mild degenerative changes in the thoracic spine with a dextroscoliosis visualized .
    OUTPUT:
    
Patchy bibasilar airspace opacities could reflect aspiration or infection .