Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are very low , but the findings suggest mild - to - moderate cardiomegaly . Within the limitations of technique which include AP view as well as high soft tissue attenuation , the mediastinal and hilar contours are likely within normal range and the lungs show no definite focal opacity . There is no pleural effusion or pneumothorax . Mild degenerative changes are similar along the mid - to - lower thoracic spine .
    OUTPUT:
    
Cardiomegaly . Limited examination , but no definite evidence for acute disease .