Pediatric renal non-hodgkin lymphoma with inferior vena cava thrombosis.

Involvement of kidneys in disseminated lymphoma is common. Primary lymphoma of the kidney is rare and has varied imaging characteristics. Abdominal lymphadenopathy can result in encasement and narrowing of the retroperitoneal vessels occasionally causing thrombosis. We present a 12-year-old boy with renal lymphoma and inferior vena caval thrombus; discuss the rarity of this presentation as well as other differential diagnosis and the need for confirmation of histopathologic diagnosis before instituting therapy in pediatric renal tumors.