Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP chest film ___ at 06 : 13 is submitted .
    OUTPUT:
    
Left subclavian PICC line unchanged in position . Persistent low lung volumes with improved aeration at both bases and decreased ongestion of the perihilar vasculature . These findings would suggest that at least some of the findings on the prior study correlated with pulmonary edema which has now resolved . There is still residual patchy opacity primarily at the left base which may reflect atelectasis . There are likely small layering bilateral effusions . No pneumothorax is seen . The lung apices are partially obscured by an oxygen mask .