Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube has been placed through the patient 's existing tracheostomy site with tip in the proximal right mainstem bronchus . The cardiac and mediastinal contours are unremarkable . Lungs remain clear without focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormalities demonstrated . Percutaneous gastrostomy catheter is incompletely imaged .
    OUTPUT:
    
Endotracheal tube tip terminates in the proximal right mainstem bronchus and recommend withdrawal by approximately 4 cm .