Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are markedly diminished . No consolidation or edema is noted . The mediastinum is unremarkable . The cardiac silhouette remains top normal for size accounting for patient and technical factors . No effusion or pneumothorax is seen . The osseous structures reveal an interval thoracotomy defect involving the posterior left sixth rib . Degenerative changes are seen throughout the thoracic spine .
    OUTPUT:
    
Limited study given low lung volumes . Apparent interval thoracotomy . No acute pulmonary process .