Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal but right heart border is partially obscured . The mediastinal and hilar contours are remarkable forced slight prominence of the ascending aorta contour , which may reflect tortuosity or mild dilation . The pulmonary vasculature is normal . Lungs are clear except for a subtle patchy right middle lobe opacity . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy right middle lobe opacity which could potentially represent an early focus of pneumonia . Mildly tortuous or slightly dilated ascending aorta .