Inferior Vena Cava Occlusion and Ilio-Iliac Arteriovenous Fistula Caused by Tumor Invasion: A Case Report.

An 80-year-old woman presented with general fatigue and leg edema for several months. Ultrasonography and contrast-enhanced computed tomographic angiography revealed inferior vena cava thrombosis, ilio-iliac arteriovenous fistula (AVF), and iliac artery pseudoaneurysm. Furthermore, malignant cells were observed in the aspirated thrombus. Although thrombus aspiration and anticoagulant therapy were unsuccessful in reducing the thrombotic mass and alleviating her symptoms, endovascular therapy for AVF and pseudoaneurysm improved her leg edema without recurrence or any endoleak. These findings highlight that endovascular therapy can be effective in older adults with cancer because of its low invasiveness.