Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A tracheostomy tube appears properly positioned though partially obscured by the patient 's O2 mask . There is no pneumothorax , focal consolidation , or pleural effusion . Mild bibasilar atelectasis is exaggerated by low lung volumes .
    OUTPUT:
    
Tracheostomy appears appropriately positioned but partially obscured by an O2 mask . No pneumothorax .