Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable supine view of the chest . Endotracheal tube is seen entering the right mainstem bronchus . Retraction by at least 3 - 4 cm is recommended . Endogastric tube descends just beyond the GE junction . Mild left basal atelectasis . Otherwise lungs appear clear . No supine evidence for effusion or pneumothorax . Cardiomediastinal silhouette appears grossly within normal limits . No acute bony abnormalities .
    OUTPUT:
    
1 . Right mainstem bronchus intubation . Retraction by 3 - 4 cm is recommended . 2 . Advancement of the OG tube by at least 8 - 10 cm would result in more optimal positioning . 3 . Mild left basal atelectasis