Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Erect portable views of the chest were obtained . There are low lung volumes . There is left greater than right bilateral perihilar opacities , may relate to asymmetric pulmonary edema , although could also relate to infectious process . There is blunting of the left greater than right bilateral costophrenic angles , concerning for small bilateral pleural effusions . The cardiac silhouette is top normal to mildly enlarged , likely accentuated by AP technique and low lung volumes . No definite evidence of free air on this radiograph , although CT performed earlier the same date may be more sensitive . Air distended loops of relatively featureless bowel are partially imaged in the upper abdomen , correlate with CT performed earlier today , history of ischemic colitis .
    OUTPUT:
    
1 . No evidence of free air is seen beneath the diaphragms . 2 . Left greater than right bilateral perihilar opacities may relate to asymmetric edema versus infection , depending on the clinical scenario . Blunting of bilateral costophrenic angles consistent with small bilateral pleural effusions . 3 . Air distended loops of relatively featureless bowel are partially imaged in the upper abdomen , correlate with CT performed earlier today , history of ischemic colitis .