Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette is mildly enlarged . Mediastinal and hilar contours are unremarkable . There is no pulmonary vascular congestion . Retrocardiac streaky opacity likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . Multilevel degenerative changes are noted in the thoracic spine with anterior osteophyte formation .
    OUTPUT:
    
Minimal retrocardiac atelectasis . No evidence of mediastinal widening .