Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP supine chest radiograph . Endotracheal tube terminates 3 .7 cm above the carina . NG tube descends inferiorly along the thoracic midline , the tip is poorly visualized . Midline sternotomy wires and mediastinal clips are noted . Mild cardiomegaly with hilar congestion . Retrocardiac space poorly assessed , though difficult to exclude effusion and left basilar consolidation . No pneumothorax . Bony structures intact .
    OUTPUT:
    
1 . Cardiomegaly with hilar congestion . 2 . Retrocardiac opacity - difficult to exclude effusion or consolidation . 3 . ET tube positioned appropriately . 4 . NG tube tip not visualized .