Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is marked thoracic scoliosis . Linear opacities at the left lung base likely relates to atelectasis , although appear more conspicuous as compared to the prior study and a subtle underlying infection is not excluded in the appropriate clinical setting . Initially , there is very subtle left perihilar opacity . No pleural effusion is seen . There is no evidence of pneumothorax . There is no pulmonary edema . The cardiac silhouette appears top - normal to mildly enlarged . The mediastinal contours are unremarkable . Aortic knob is calcified .
    OUTPUT:
    
Marked scoliosis . Left basilar linear opacities likely due to atelectasis / scarring , however , appear more conspicuous as compared to the prior study . Additional subtle left perihilar opacity . Subtle underlying infection is not excluded in the appropriate clinical setting . No pulmonary edema .