Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left supraclavicular approach central venous catheter is in place with the tip terminating at the superior SVC . The course of the line is unremarkable without evidence of pneumothorax . Mild bibasilar atelectasis is noted . There is blunting of the left costophrenic angle , which may represent a small amount of pleural fluid . The pulmonary vasculature is not engorged and there is no overt pulmonary edema . The cardiac silhouette is mildly enlarged but stable . The mediastinal and hilar contours are within normal limits and unchanged . Mild calcification of the aortic knob is noted .
    OUTPUT:
    
1 . Left supraclavicular approach central venous catheter with tip in the upper SVC . 2 . Mild bibasilar atelectasis . 3 . Possible trace left pleural effusion .