Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right internal jugular dialysis catheter terminates in right atrium . Prosthetic aortic valve is noted . Tracheostomy tube is in unchanged position . There is no large pleural effusion . Cardiomediastinal silhouette is normal size . A pigtail catheter is noted overlying the mid abdomen . Mild left upper lung opacity is similar to before and may reflect asymmetric clearing of pulmonary edema or pneumonia in correct clinical setting .
    OUTPUT:
    
Mild left upper lung opacity is similar to before and may reflect asymmetric clearing of pulmonary edema or pneumonia in correct clinical setting .