Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest ___ at 12 :09 are submitted .
    OUTPUT:
    
There has been interval removal of the right chest tube . No pneumothorax is seen . A portion of the ventriculoperitoneal shunt is again seen coursing over the right hemithorax . Lung volumes remain low with improved aeration at the right base and patchy opacity at the left base which most likely represents atelectasis , although pneumonia can not be excluded . Overall cardiac and mediastinal contours are stable . No pulmonary edema .