Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is mild upper zone redistribution and indistinctness of pulmonary vascularity suggesting borderline congestion , although not striking . As seen previously , the left costophrenic sulcus appears effaced with patchy streaky opacities at the lung bases , but without substantial change suggesting a more chronic form of basilar atelectasis . A moderate hiatal hernia , seen on the prior CT is not visible on this study . There is no pleural effusion or pneumothorax . Bones appear demineralized . There are mild similar degenerative changes throughout the thoracic spine .
    OUTPUT:
    
Borderline findings suggesting vascular congestion . Patchy basilar opacities , but with little if any change and more suggestive of chronic atelectasis or scarring than acute pneumonia , although it is difficult to completely exclude an ongoing infectious process .