Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In the interim , the patient has been extubated , and an enteric tube removed . Lung volumes remain low . There has been mild improvement in left lower lobe atelectasis . Dense retrocardiac opacity persists and may reflect atelectasis , aspiration , or pneumonia . Bilateral perihilar parenchymal opacities are little changed and reflect mild pulmonary edema . There is no pneumothorax . The heart size has decreased in the interim , though the azygos remains markedly distended . There is marked gaseous distention of the stomach .
    OUTPUT:
    
1 . Dense retrocardiac opacification which may reflect persistent atelectasis , though aspiration or pneumonia is not excluded . 2 . Unchanged mild perihilar pulmonary edema . 3 . Gaseous distention of the stomach raises the risk for aspiration . Findings were discussed with Dr . ___ at 1 :50 p .m . by phone .