Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Oblique images of the chest show that the previously seen fullness in the left hilum was likely due to superimposition of normal vascular structures . The abnormal mediastinal contour persists and most likely represents a tortuous aorta . Lungs are clear without consolidation or edema . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Tortuous ascending aorta with or without a component of dilation . Consider CT scan for further evaluation if warranted clinically . 2 . Previously seen left hilar fullness is likely due to superimposition of vascular structures .