Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP semi upright view of the chest . Lung volumes are low . Overlying EKG leads present . Lung volumes are low . Ill - defined opacities in the lower lungs most compatible with atelectasis though pneumonia / aspiration difficult to exclude in the correct clinical setting . Heart size appears top - normal . No large effusion or pneumothorax . Mediastinal contour is grossly unremarkable . Aortic atherosclerosis cells atherosclerotic calcification noted . No bony abnormalities . Clips the right upper quadrant noted .
    OUTPUT:
    
Subtle opacities the lower lungs may represent atelectasis versus pneumonia / aspiration .