Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest radiograph ___ at 04 : 20 is submitted .
    OUTPUT:
    
There is increasing opacity at the left base which although could reflect atelectasis , is concerning for aspiration or pneumonia . No pulmonary edema . Overall cardiac and mediastinal contours are stable given differences in patient positioning . Right subclavian PICC line continues to have its tip at the cavoatrial junction . A right - sided VP shunt is again visualized . No pneumothorax .