Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are similar to prior . Heart size is normal . The mediastinal contours are normal . Right perihilar linear opacity is likely atelectasis . The pulmonary vasculature plethora may be progressing to congestion . No focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
1 . No pneumonia or effusion . 2 . Right perihilar atelectasis . Followup is recommended to document resolution as well as better evaluation of possibly obscured right lung lesions .