Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly has been stable compared to exams dated back to ___ . The lung volumes are low resulting in crowding of the bronchovascular structures . The hilar and mediastinal contours are otherwise unremarkable . There is no pulmonary vascular congestion . There may be small bilateral pleural effusions . Mild bibasilar atelectasis is persistent . There is no pneumothorax . The visualized osseous structures are unremarkable . There is no free air under the diaphragm .
    OUTPUT:
    
No evidence of subdiaphragmatic free air .