Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . Patchy and linear opacities are present in the mid and lower lungs , most confluent in the left retrocardiac area . Overall , lung volumes are increased compared to the prior study and overall aeration of the lungs is generally improved .
    OUTPUT:
    
Patchy and linear mid and lower lung opacities favoring atelectasis . Followup radiographs may be helpful to exclude focal pneumonia in left lower lobe .