Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right - sided Port - A - Cath tip terminates in the low SVC . Mild cardiomegaly is unchanged . The mediastinal and hilar contours are similar . The pulmonary vasculature is not engorged . Patchy opacities are seen within the left lung base , potentially atelectasis , and not substantially changed from the prior exam . No focal consolidation , pleural effusion or pneumothorax is demonstrated . H - shaped vertebra are compatible with a history of sickle cell disease .
    OUTPUT:
    
Patchy left basilar opacity is likely atelectasis , similar to that seen on the prior radiograph .