Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided Port - A - Cath tip terminates in the low SVC . Heart size is normal . Mediastinal and hilar contours are unremarkable , and known left hilar lesion is not well assessed on the current exam . Pulmonary vasculature is not engorged . Patchy ill - defined retrocardiac opacity persists . Minimal atelectasis is seen in the right lung base . No large pleural effusion or pneumothorax is demonstrated . There are moderate degenerative changes identified within the thoracic spine .
    OUTPUT:
    
Persistent patchy retrocardiac opacity , which may reflect continued atelectasis though infection is not excluded .