PMC2796236_01
Computed tomography scan demonstrating right, fat containing, renal mass with renal vein and vena cava involvement (arrow).
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fig1
Two years later, an abdominal computerized tomography control revealed a 45 mm fatty mass of the right renal sinus extended to the renal vein and the IVC as a tumour thrombus (Figure 1). 
Gross specimen of right kidney with fatty sinusal tumor and yellowish tumor thrombus.
CRM2009-789078.002.jpg
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fig2
Pathological analysis confirmed the diagnosis of conventional angiomyolipoma with a 60 mm caval fatty thrombus (Figure 2).