Today is the fourth and last example of the Mickey Mouse sign in the field of medicine. The image below comes from a 63-year-old man with diabetes mellitus who underwent ultrasound scanning of the femoral arteries (types of arteries in the legs). The picture below (presented in this article) shows a Mickey Mouse appearance formed by the presence of a blood clot in the legs. Such blood clots are not always associated with symptoms and can be deadly. The presence of the Mickey Mouse sign on such scans helps identify such blood clots much easier. Be sure to check out the first, second, and third examples of the Mickey Mouse sign. The image below is copyrighted by BMJ Publishing Group Ltd & the British Association for Accident and Emergency Medicine.