Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Nasogastric tube is looped several times within the stomach . Cholecystectomy clips in the right upper quadrant are unchanged . Lung volumes are extremely low , exaggerating bronchovascular markings . Diffuse heterogeneous parenchymal opacities are consistent with pulmonary edema . There is bilateral lower lung atelectasis and a small right pleural effusion . Heart size and cardiomediastinal contours are stable .
    OUTPUT:
    
1 . NG tube is looped several times within the stomach . 2 . Very low lung volumes with diffuse parenchymal opacities , improved since the prior exam , consistent with either pulmonary edema or fibrosis .