Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged , with redemonstration of tortuosity of the thoracic aorta . Mediastinal width is unchanged from prior examination and is likely slightly exaggerated by slight leftward patient rotation as well as levoscoliotic curvature of the thoracic spine . Hilar contours are unremarkable . There is a vague opacity obscuring the left heart border although not depicted on the lateral view . Pleural surfaces are clear without effusion or pneumothorax . Eventration of the right hemidiaphragm is unchanged . Prominent degenerative changes of bilateral shoulders are noted .
    OUTPUT:
    
Vague opacity suspected in the lingula ; early pneumonia or atelectasis could be considered .