Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy is in - situ , unchanged in position compared to the prior study . The patient is somewhat rotated . Lung volumes are within normal limits . Patchy airspace opacities are noted at the left lung base , better appreciated on the CT chest . No pleural effusion seen . No pneumothorax seen .
    OUTPUT:
    
Patchy opacities of the left lung base better evaluated on the CT chest from the prior day .