Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Aside from the previously noted hiatal hernia and minimal venous engorgement , the cardiomediastinal silhouette is normal . Low lung volumes results in vascular crowding , but the lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .