Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube is seen with tip in the right mainstem bronchus by at least 1 .5 cm . Enteric tube passes below the inferior field of view . There is retrocardiac opacity , likely atelectasis given relatively low lung volumes . Minimal right basilar atelectasis is also noted . Lungs are otherwise clear given low lung volumes . The cardiomediastinal silhouette is also within normal limits for these reasons . Atherosclerotic calcifications seen at the aortic arch . No acute osseous abnormalities .
    OUTPUT:
    
Right mainstem bronchus intubation . Repositioning is advised .