Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable AP upright view of the chest is provided . Apparent enlargement of the cardiac silhouette may relate to low lung volumes and the AP technique . Cardiomediastinal silhouette is stable . The lungs are low in volume but clear without focal consolidation , pleural effusion , or pneumothorax . An AICD device is again demonstrated over the left chest with a single lead terminating in the right ventricle .
    OUTPUT:
    
No acute intrathoracic abnormality .