Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette is borderline enlarged . In the interim , the patient has been intubated . The tip of the endotracheal tube extends into the right mainstem bronchus . Atelectasis in the left lung base is noted . Crowding of bronchovascular structures is demonstrated without overt pulmonary edema . No pleural effusion or pneumothorax is present . Hypertrophic changes are seen in the thoracic spine .
    OUTPUT:
    
Right mainstem bronchial intubation .