Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size appears mildly enlarged but unchanged . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Subsegmental atelectasis is demonstrated in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present . Deformity of a right - sided rib appears chronic . No acute osseous abnormality is otherwise demonstrated . Moderate degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .