Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left internal jugular central venous catheter tip terminates within the upper SVC , unchanged . Lung volumes are low . Heart size is borderline enlarged . Mediastinal and hilar contours are unremarkable . There is crowding of bronchovascular structures without overt pulmonary edema . Patchy opacities with the lung bases are more pronounced on the left , potentially atelectasis . No large pleural effusion or pneumothorax is detected . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with patchy opacities in the lung bases , potentially atelectasis , though infection is difficult to exclude in the correct clinical setting .