Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes . The cardiac silhouette is mildly enlarged . Crowding of vasculature in the right infrahilar region is likely due to low lung volume . No definite consolidation is identified . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .