Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta remains mildly tortuous . Mediastinal and hilar contours are otherwise unremarkable . The pulmonary vasculature is normal . Patchy opacities are noted in the lung bases , new in the interval . No pleural effusion or pneumothorax is identified . Moderate multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Patchy opacities in the lung bases are nonspecific and may reflect atelectasis .