Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine AP portable view of the chest was obtained . There are low lung volumes , making evaluation suboptimal . There are perihilar opacities , left greater than right , which may be due to asymmetric pulmonary edema , although infectious process is not excluded . Given that the left costophrenic angle is not fully included on the image , no large pleural effusion is seen . There is no evidence of pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Low lung volumes , making evaluation suboptimal . Left greater than right perihilar alveolar opacities could relate to asymmetric edema versus infection .