Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient has a right - sided aortic arch and right - sided descending thoracic aorta . Heart size and pulmonary vascularity are normal . Within the lungs , an improving band - like area of opacity is present in the left lung base . No focal areas of consolidation are present , and there are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Improving linear atelectasis left lung base . No new areas of opacity to suggest pneumonia .