Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph ___ at 12 :48 is submitted .
    OUTPUT:
    
There is a patchy retrocardiac opacity with a suggestion of air bronchograms concerning for aspiration or pneumonia . In addition , there is patchy heterogeneous opacity along the medial left upper lung also concerning for aspiration , less likely atelectasis . The right hemidiaphragm remains elevated with patchy opacity at the base suggestive of atelectasis given the low lung volumes . Probable layering left effusion . No pulmonary edema . Heart is stably enlarged with a left ventricular prominence . No pneumothorax . Clips in the right upper quadrant suggest prior cholecystectomy .