Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly underinflated , but grossly clear . Prominence of the right infrahilar pulmonary vasculature is a stable finding , likely secondary to diminished lung volumes . Heart size is top - normal , as before . There is no pleural effusion or pneumothorax . The descending thoracic aorta is mildly tortuous , a chronic finding . Mediastinal contours are otherwise within normal limits .
    OUTPUT:
    
Mildly underinflated lungs , but no evidence of pneumonia , pleural effusion , or pneumothorax .