Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hyperinflated . The cardiomediastinal silhouette and pulmonary vasculature are unremarkable . Increased interstitial markings are seen throughout the bilateral lungs , but particularly the bases , and may be related to a chronic interstitial process . No focal consolidation is identified . There is no pleural effusion or pneumothorax . Old healed bilateral rib fractures are noted .
    OUTPUT:
    
No acute intrathoracic abnormality .