Abstract
Our patient was a 61-year-old man with dedifferentiated chondrosarcoma
(DCS) and a benign thrombus or a tumor thrombus. We diagnosed the
patient with a tumor thrombus by angioscopic observation of a
smooth-surfaced, white, elevated lesion in the IVC that had invaded the
vein wall. Although anticoagulant therapy was discontinued, his
condition progressed without an elevation in D-dimer levels or the
appearance of new thromboembolism. After one course of chemotherapy, the
patient refused to continue the treatment and was treated with
palliative care. He died of the underlying disease approximately half a
year later. This is the first case of a DCS patient where benign and
tumor thrombi was differentiated by angioscopy. Angioscopy is one of the
useful tools for this differentiation which can evaluate the color tone
and surface properties of an object.