Burkitts lymphoma (biopsy proven) of the large bowel with bilateral hydronephrosis secondary to encasement of bilateral ureters. Burkitt lymphoma is named after Denis Parsons Burkitt, who mapped its peculiar geographic distribution across Africa. It is a high-grade B-cell neoplasm and has 2 major forms, the endemic (African) form and the nonendemic (sporadic) form. Burkitt lymphoma is a childhood tumor but it is observed in adult patients. Burkitt lymphoma is one of the fastest growing malignancies in humans, with a very high growth fraction.