Tumor Thrombus Arising from Osteosarcoma

Abstract

Tumor thrombus is a rare finding in patients diagnosed with osteosarcoma. A patient presented to our hospital with left knee pain and was diagnosed with osteosarcoma. Several months later, because of acute left foot swelling, a unilateral lower extremity venous duplex exam was performed and the patient was diagnosed with deep vein thrombosis (DVT). After further surgeries and tests, the previously diagnosed DVT was realized to be tumor thrombus. Although tumor thrombus mimics DVT on ultrasound, it is important to note subtle differences that may assist in making the correct diagnosis.