Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The aortic arch is calcified . The right hemidiaphragm is moderately elevated . The colon appears interposed beneath the right hemidiaphragm which probably explains lucency beneath the diaphragm . On the left side , there is a small pneumothorax . The distance between the superior pleural edge and the chest wall is about 14 mm . The lungs appear clear . There is no pleural effusion . There is a very mildly displaced posterior lateral left eighth rib fracture .
    OUTPUT:
    
Small pneumothorax on the left . Minimally displaced left eighth rib fracture . Moderate relative elevation of the right hemidiaphragm ; lucency beneath the right hemidiaphragm is probably due to colonic interposition .