Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streaky left basilar opacity suggests minor atelectasis . Widening of the mediastinum without obscuration of the right hilum is of unclear clinical significance . A tortuous aorta is present . The cardiac contour is unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Apparent mediastinal widening of unclear clinical significance but likely due to unfolding aorta . However , given that there is no prior study for comparison , PA and lateral chest radiographs should be performed for more detailed assessment .