Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The endotracheal tube terminates 4 cm above the carina . No change in the left subclavian PICC line and NG tube . Previously described left retrocardiac opacity has improved . Small left pleural effusion is likely unchanged , despite differences in patient positioning . The lungs are otherwise clear without pneumothorax or focal consolidation .
    OUTPUT:
    
1 . Endotracheal tube terminates 4 cm above the carina . 2 . Interval improvement in the left retrocardiac opacity , with persistent small left pleural effusion .