Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are chronically low likely due in part to severe thoracic kyphosis . The air spaces appear clear without evidence of pneumonia . The heart is mildly enlarged . The mediastinal and hilar contours are unremarkable . Pleural effusion likely on the left obscures the posterior costophrenic sulcus . As before the thoracic aorta is tortuous . Compression deformities of multiple vertebral bodies are re - demonstrated .
    OUTPUT:
    
Small pleural effusion , likely on the left . Otherwise no evidence of acute cardiopulmonary process .