Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are normal . New blunting of the left lateral CP angle could be atelectasis or small area of infection , the upper lungs are clear . There is no pneumothorax or pleural effusion . There are mild degenerative changes in the thoracic spine
    OUTPUT:
    
Small opacity in the left lower lobe could be atelectasis or pneumonia in the appropriate clinical setting