Presentation of Case A 46-year-old man was admitted to the hospital because of leg swelling and a mass in the popliteal fossa. The patient was well until eight months earlier, when he fell while skiing and forced his right knee into a position of full flexion; he immediately felt a snap and experienced pain. He was able to ski down the mountain, but he remained inactive for the next several days, with improvement in the pain. During the next two months he believed that he had recovered completely. Five and a half months before admission, after a transatlantic flight, spontaneous.
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