Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP semi-erect chest radiograph ___ at 17 :43 is submitted .
    OUTPUT:
    
Interval placement of a left basilar pleural pigtail catheter with increasing aeration at the left base . No definite pneumothorax . Patchy opacities at both bases likely reflect atelectasis , although pneumonia can not be entirely excluded . Crowding of the vasculature in the setting of low volumes with no overt pulmonary edema . The heart remains stably enlarged .