Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accentuating pulmonary vascular crowding . The lungs are clear . Mediastinal contours , hila , and cardiac silhouette are normal . No pleural effusion or pneumothorax . Residual contrast is seen in the in the colon .
    OUTPUT:
    
No evidence of pneumonia .