Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided central venous catheter terminates in the mid SVC . Lung volumes are low which results in crowding of the bronchovascular structures , but without overt pulmonary edema . Patchy opacity in the left lung base laterally is increased compared to the previous examination , and a tiny left pleural effusion may be present . There is no large pleural effusion on the right or evidence for focal consolidation . Mild cardiomegaly is unchanged . No pneumothorax is identified .
    OUTPUT:
    
Left lateral lung base patchy opacity may reflect atelectasis in the setting of low lung volumes , however infection is not excluded in the correct clinical setting . A trace left pleural effusion may be present .