Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable AP view of the chest was provided . An endotracheal tube is seen with its tip residing approximately 4 .4 cm above the carina . The lung volumes are low which limits the evaluation with probable bronchovascular crowding at the lung bases . There is equivocal opacity in the left upper lung which may reflect patient rotation . No supine evidence for effusion or pneumothorax . No definite bony abnormalities are seen . The cardiomediastinal silhouette is poorly assessed .
    OUTPUT:
    
Limited exam as stated . Appropriately positioned endotracheal tube . Equivocal left upper lung opacity which could reflect patient rotation .