Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided Port - A - Cath tip terminates within the mid SVC . There are low lung volumes . The cardiac , mediastinal and hilar contours are unremarkable and unchanged . The heart size is within normal limits . Ill - defined opacity within the left lung base may reflect an area of atelectasis , though infection can not be excluded . No pleural effusion or pneumothorax is present . There are mild degenerative changes of the thoracic spine . The pulmonary vascularity is not engorged .
    OUTPUT:
    
Ill - defined patchy opacity in left lung base . This could reflect atelectasis , though infection can not be excluded .