Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Tracheostomy tube is in unchanged position . Trach mask projects over the right lower chest . The heart is normal size , and cardiomediastinal contours are unremarkable . The lungs are well expanded and clear except for minimal linear atelectasis in the left base . No pleural effusions and no pneumothorax .
    OUTPUT:
    
No significant changes compared to the prior study . No radiographic evidence of acute pneumonia .