Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . Heart size is normal . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is normal . Subsegmental atelectasis is demonstrated within the lingula . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes visualized in the thoracic spine .
    OUTPUT:
    
Lingular subsegmental atelectasis . No definite focal consolidation to suggest pneumonia .