Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs . Left - sided pectoral pacer leads and aortic endograft are in stable position . Upper - lobe predominant , peripheral linear and nodular opacities are not present on prior radiographs . There is no pleural effusion or pneumothorax . Mild cardiomegaly is unchanged .
    OUTPUT:
    
Etiology of peripheral nodular interstitial opacities is uncertain and further charachterized with CT - Chest is reasonable . Findings were discussed by Dr . ___ with Dr . ___ by phone at 9 : 50 a .m . on ___ .