Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Widening of left superior mediastinum with associated rightward deviation and narrowing of the trachea corresponds to enlargement of left lobe of thyroid gland on it recent CT , more fully characterized on that study . Heart is upper limits of normal in size , in the aorta is tortuous . Patchy opacities in the right perihilar and both basilar regions are present as well as a linear focus of atelectasis at the left base . Postoperative changes are noted in the left cervical region .
    OUTPUT:
    
Patchy right perihilar and basilar opacities may reflect atelectasis or aspiration in the immediate postoperative setting .