Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable supine view of the chest . 2 discrete round metallic densities project over the heart , likely external . The endotracheal tube is seen with its tip positioned 4 .7 cm above the carina . The NG tube passes into the left upper abdomen . There is a linear density in the left lower lung which may represent atelectasis . Adjacent vague opacity is also noted , possibly representing aspiration or pneumonia . The right lung is clear . No supine evidence for effusion or pneumothorax . The cardiomediastinal silhouette appears grossly unremarkable . No acute bony injuries .
    OUTPUT:
    
1 . ET tube position with tip 4 .7 cm above the carina . NG tube positioned appropriately . 2 . Left basal atelectasis with adjacent opacity , likely aspiration or pneumonia . 3 . 2 discrete rounded metallic densities projecting over the heart , likely external though clinical correlation is advised .