Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . Aside from rightward convex curvature centered along the lower cervical spine , which appears unchanged , the osseous structures are unremarkable . A left basilar opacity has cleared since ___ . There is no evidence for free air .
    OUTPUT:
    
No evidence of acute disease including no free air .