Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided central venous catheter has been removed . The heart size is normal . The mediastinal and hilar contours are unchanged . Evidence of volume loss in the right lung with elevation of the right hemidiaphragm and collapse of the right middle lobe appear chronic . Linear opacities within the right lung base likely reflect right lower lobe subsegmental atelectasis . Left lung is clear . No pleural effusion is identified . The pulmonary vascularity is not engorged , and there is no pneumothorax . No acute osseous abnormality is identified . Partially seen is anterior cervical fusion hardware .
    OUTPUT:
    
Chronic right middle lobe collapse with adjacent right lower lobe subsegmental atelectasis .