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The development of acute DVT in children is unusual. As a result, DVT prophylaxis and screening is unnecessary in young children with only two risk factors for the development of the disease. Young age appears to be an important protective risk factor for the prevention of DVT.

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A sarcoma, arising in association with a prosthetic arterial graft, was surgically excised. The patient, a 31‐year‐old man, sustained a soft tissue injury to the thigh 10 years previously. A lacerated superficial femoral artery was repaired with a woven teflon‐dacron graft. A large tumor surrounded, but did not invade, the graft. The tumor posed diagnostic difficulties and was thought to be either an angiosarcoma or a fibrosarcoma. Electron microscopy, performed retrospectively, showed the tumor to be probably a fibrosarcoma. The relationship of the tumor to the graft and similar experimentally induced tumors are discussed.