Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities within the right middle and lower lobes likely represent areas of subsegmental atelectasis . The remainder of the lungs are clear . There is no pneumothorax . No vascular congestion or overt pulmonary edema is identified . There is no large pleural effusion . The right hemidiaphragm is elevated . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Probable sugsegmental atelectasis in the right lung base . No pleural effusion .