Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate low lung volumes which results in bronchovascular crowding . There are stable severe interstitial reticular - nodular opacities present , consistent with known chronic interstitial lung disease . No evidence of pulmonary edema , consolidation , pleural effusion , or pneumothorax . The cardiomediastinal and hilar contours are unchanged .
    OUTPUT:
    
Interstitial opacities consistent with known chronic interstitial lung disease . No obvious superimposed pneumonia .