Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal upright chest radiograph is obtained . Tracheostomy tube projects approximately 3 .5 cm above the carina . Right - sided Port -A - Cath is in the lower SVC . Heart is mildly enlarged , but the cardiomediastinal contour is otherwise unremarkable . Linear basilar opacities likely represent atelectasis . Lungs are clear . No large pleural effusion or pneumothorax is identified . Bony structures are grossly intact .
    OUTPUT:
    
No evidence of pneumonia .