[Surgical treatment of primary leiomyosarcoma of the inferior vena cava].

CASE REPORT: pLMS in the wall of the inferior vena cava is an extremely rare form of retroperitoneal malignancies. A case in a young female patient is presented; clinical symptoms, pre- and postoperative diagnosis and surgical treatment are discussed. A retroperitoneal mass detected by imaging was found to be a large tumor mass located at the middle segment of the IVC on exploration. The tumour was successfully excised and the IVC was reconstructed with a synthetic graft. Eight years later, this patient needed a repeat surgery due to local recurrence. This time tumour was attached to the left renal vein. A re-resection of the IVC was performed with subsequent synthetic graft reconstruction and the distal end of the left renal vein was reimplanted into a lower segment of IVC.

DISCUSSION: Primary leiomyosarcoma of the inferior vena cava (pLMS-IVC) is an extremely rare form of retroperitoneal malignancies. The tumour arises from the medial layer of the venous wall and can grow either intraluminally, or extraluminally or in both directions, as well. It can be localized in the first segment of IVC (above the hepatic veins), in the second segment between hepatic and renal veins and finally in the third segment between the right common iliac vein and renal veins. Therefore, the tumour can infiltrate both hepatic and/or renal vessels. Upper segment tumours can cause Budd-Chiari syndrome (hepatomegaly, abdominal pain, jaundice and ascites) with a bad prognosis. Middle segment tumours usually present with right upper quadrant pain, or may mimic biliary tract disease with a much better prognosis. Accumulating experience suggests that radio-chemotherapy alone seems to be less effective than "en bloc" resection with clear margins including loco-regional lymph nodes. Therefore, our choice of treatment was the latter. Although radical resection can be carried out in most of cases, 50% of patients develop a late recurrence yet.