Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: It is very difficult to discern the tip of the endotracheal tube , however it appears to lie approximately 4 cm above the carina . A right IJ sheath extends the midportion of the SVC . A left - sided PICC line extends to the lower SVC . There has been little change since the chest radiograph from the prior day , with an extensive retrocardiac opacification consistent with volume loss in the left lower lobe . There are less prominent changes at the right base , which appears to be improving .
    OUTPUT:
    
1 . Retrocardiac opacity consistent with volume loss of the left lower lobe , with improving less prominent changes at the right lung base . 2 . Lines and monitoring devices as described above .