Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is re - demonstrated . The aorta is tortuous . The mediastinal and hilar contours are similar . Lungs remain hyperinflated . Pulmonary vasculature is not engorged . Patchy ill - defined opacities are most pronounced in the lung bases , and perhaps slightly progressed in the interval likely reflecting bronchiectasis with evidence of small airways infection , compatible with the patient 's history of chronic MAC infection . No pleural effusion or pneumothorax is present . Moderate degenerative changes of both glenohumeral joints are noted . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Patchy ill - defined bibasilar airspace opacities , perhaps slightly progressed in the interval , and compatible with the patient 's known history of chronic MAC infection .