A Case of Intra and Extra-vascular Lipoma of the Subclavian Vein

Intravascular lipoma of the renal vein

“…Intravenous contrast demonstrates a filling defect, corresponding to the intraluminal location of the lipomas, although some published cases report both intra- and extravascular extension. 1,2 MRI was obtained in eight published case reports 2-9 to confirm location and fatty composition, and demonstrated non-enhancing, intravascular space occupying, T 1 and T 2 hyperintense, circumscribed fatty lesions that subtract out on fat-subtraction imaging, similar to our case described above. Others have used angiography to assess the level of obstruction, and in one angiographic study, the obstruction was demonstrated and abnormal venous collaterals were seen, suggesting longstanding disruption of venous flow.…”

Intravascular lipoma of the inferior vena cava and left renal vein

“…Intravascular lipomas are rare primary venous tumors occurring most commonly in the IVC, with a frequency of 0.35% to 0.5% on all CT scans [12] . A review of the current literature identified isolated case reports of intravascular lipomas of the SVC [3 , 7 , 8] , subclavian vein [2] , innominate vein [6] , internal jugular vein [9 , 10] , femoral vein [4 , 5] , and renal vein [11] . In our patient, two lipomas were present in the IVC and one in the left renal vein.…”

“…The most common location for these tumors is the inferior vena cava (IVC), where they are found in approximately 0.5% of the general population on contrast-enhanced computed tomography (CECT) [1] . Venous lipomas have been less frequently reported in the superior vena cava (SVC), innominate vein, subclavian vein, internal jugular vein, external iliac vein, and common femoral vein [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] . Only one case of intravascular lipoma of the right renal vein with extension to the IVC has been reported [11] .…”