Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 07 : 54 is submitted .
    OUTPUT:
    
Patchy opacity at the right medial lung base is again seen and unchanged most likely reflecting atelectasis , although pneumonia or aspiration should also be considered . Right basilar pleural pigtail catheter remains in place . A very tiny right apical pneumothorax is now present and in retrospect was likely present but not reported on the CT dated ___ . Lung volumes remain low . Overall cardiac and mediastinal contours are stable . Crowding of the pulmonary vasculature with no overt pulmonary edema .