Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable supine view of the chest . Midline sternotomy wires are noted . Patient is intubated with the tip of the endotracheal tube residing approximately 4 .3 cm above the carinal . NG tube courses into the left upper quadrant though the tip is out of the imaged field . Lungs appear clear . Cardiomediastinal silhouette appears grossly unremarkable . Subtle retrocardiac opacity may represent subtle aspiration or atelectasis . Bony structures appear grossly intact .
    OUTPUT:
    
Tubes positioned appropriately .