Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An ET tube is present , the tip lies at the level of the mid clavicular heads , approximately 6 .5 above the Carina . An NG tube is present , tip extending and beneath diaphragm , off film . The sideport , if present , is not well visualized . A left PICC line is present , tip over distal SVC . No pneumothorax is detected . No obvious mediastinal air is identified . There are slightly low inspiratory volumes , with patchy opacity at the left lung base , obscuring the left hemidiaphragm , and a small amount of patchy opacity at the right base . Probable small left effusion . Upper zone redistribution , but no overt CHF -- ___ may be accounted for by low lung volumes .
    OUTPUT:
    
Bibasilar opacities left greater than right . While this may represent atelectasis , the extent raises the possibility of aspiration or pneumonic infiltrate . Small left effusion also present . The overall appearance is not significantly changed compared with chest x-ray from ___ at 09 :04 . Upper zone redistribution , but no overt CHF --? Due to low lung volumes .