Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP upright chest radiograph was obtained . The cardiac silhouette appears normal and unchanged compared to the prior examination . Mild mediastinal prominence is likely related to differences in patient positioning and technique . The lungs demonstrate low volumes as before , but are otherwise clear without focal consolidation . There is no pleural effusion and no pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process . If high clinical concern , CT would confirm .