This is the first reported case of an intravascular lipoma in the renal vein, demonstrating that asymptomatic cases without flow obstruction can be safely managed conservatively with surveillance imaging.
Conservative surveillance may be feasible for asymptomatic non-obstructive renal vein lipomas; first case leaves management open.
Lipomas are benign neoplasms composed of adipocytes encased in a fibrous capsule. Intravascular lipomas are rare and almost always incidental findings. In the published literature, the majority are described within the inferior vena cava (IVC) and less frequently reported in the superior vena cava, brachiocephalic vein, subclavian vein, internal jugular vein, external iliac vein and common femoral vein. We present the case of a 59-year-old male who presented with a symptomatic ureteral calculus and was found to have an intravascular lipoma of the right renal vein with extension into the IVC. To our knowledge, this is the first ever report of an intravascular lipoma in the renal vein. We discuss the imaging characteristics of intravascular lipomas and the differential diagnosis that should be considered.
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Doyle et al. (2015) studied this question.
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