Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ET tube in situ with its tip below the level of the medial clavicles approximately 18 mm above the carina . Left - sided PICC line in situ with the tip in the distal SVC . No pneumothorax . Feeding tube in situ coursing inferiorly out of sight . Airspace opacification seen in the lung bases bilateral suggesting atelectasis or aspiration . No pneumothorax . Minimal fluid seen in the right transverse fissure .
    OUTPUT:
    
Low position of the endotracheal tube . Bibasal opacification which has being waxing and waning on previous serial radiographs most likely representing atelectasis or aspiration .