Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs demonstrate clear lungs bilaterally . The cardiomediastinal silhouette appears within normal limits and unchanged when compared to prior radiograph dated ___ . There is no evidence of pulmonary vascular congestion , pleural effusion , or pneumothorax . Osseous structures are without an acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality . No evidence of pneumonia .