Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tracheostomy is in standard position . A right central venous catheter terminates in the low superior vena cava . A right PICC terminates in the expected location of the right subclavian vessels . Right upper lung linear opacities likely represent atelectasis . Subtle opacity over the right lower lung field may represent atelectasis , aspiration , or a small focus of infection . Retrocardiac linear opacity likely represents atelectasis . No pleural effusion or pneumothorax is detected on these views . Heart size is enlarged but may be exaggerated by AP technique and low lung volumes . There is mediastinal venous fullness . The aorta is tortuous and calcified .
    OUTPUT:
    
Subtle hazy opacity over the right mid - to - lower lung field , which most likely represents atelectasis , but a small focus of infection can not be excluded .