Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously described left lung base rounded , retrocardiac opacity is not definitively visualized on this examination . Redemonstrated are diffuse , coarse interstitial markings , most significant at the bilateral lung apices , unchanged from the prior examination . Non-specific septal lines are noted along the periphery of left lower lobe , new since the prior examination . Small bilateral pleural effusions are noted . There is no focal consolidation , pneumothorax , or pulmonary edema identified . The cardiomediastinal silhouette is grossly unremarkable . There are no acute bony abnormalities detected .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Unchanged , diffuse parenchymal scarring , most significant at the bilateral lung apices . Non-specific left lower lobe septal lines . 3 . Small bilateral pleural effusions .