Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . Homogeneously distributed diffuse interstitial markings are seen , suggestive of an old interstitial abnormality . There is no evidence of pneumonia or pulmonary edema . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette demonstrates mild cardiomegaly .
    OUTPUT:
    
1 . Mild cardiomegaly . 2 . Homogeneously distributed diffuse interstitial markings suggestive of an old interstitial abnormality .