Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Endotracheal tube is seen with its tip residing 4 .3 cm above the carina . There is no focal consolidation , effusion , or pneumothorax . Mild retrocardiac atelectasis is noted . Heart size appears top - normal . The mediastinal contour is normal . Imaged osseous structures are intact .
    OUTPUT:
    
Endotracheal tube positioned appropriately . Top normal heart size .