Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged with mild tortuosity of the thoracic aorta . Hilar contours are unremarkable . A left - sided ICD is unchanged in position . The lungs are clear . There is no evidence of fluid overload or interstitial edema . There is no pleural effusion or pneumothorax . Degenerative changes are noted throughout the thoracic spine .
    OUTPUT:
    
Mild cardiomegaly without evidence of interstitial edema .