Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are within normal limits . The pulmonary vasculature is normal . No focal consolidation or pneumothorax is present . Patchy opacities in the lung bases likely reflect areas of atelectasis . Minimal blunting of the costophrenic angles posteriorly suggests the presence of trace bilateral pleural effusions . Mild to moderate degenerative changes are noted in the thoracic spine . Clips from prior cholecystectomy are seen in the right upper quadrant of the abdomen .
    OUTPUT:
    
Patchy opacities in the lung bases , likely atelectasis , with probable trace bilateral pleural effusions .