Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low which leads to bronchovascular crowding . There is atelectasis at the left lung base . There is pulmonary vascular congestion without overt edema . No pleural effusion or pneumothorax is seen . A left chest pacemaker is in standard position .
    OUTPUT:
    
Mild pulmonary vascular congestion without overt edema .