Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new left pleural effusion with associated atelectasis . The right internal jugular catheter terminates in the low SVC . There is no pulmonary vascular congestion or pneumothorax . The heart size is normal . The cardiac , hilar , and mediastinal contours are within normal limits .
    OUTPUT:
    
New small left pleural effusion with associated atelectasis . Underlying pneumonia can not be excluded .