<prompt> Answer this question truthfullyWhat is the classification system used for staging Burkitts lymphoma?  <response>: <reason> According to the Murphy staging system, there are four stages of Burkitts lymphoma based on the number of nodes involved and the extra nodal spread.Staging for Burkitts lymphoma is provided in the following table: Murphy staging system Stage Features Stage I Single nodal or extra nodal site involvement excluding mediastinum or abdomen Stage II Single extra nodal tumor with regional nodal involvement Two extra nodal tumors on one side of diaphragm Primary gastrointestinal tumor with or without associated mesenteric nodes Two or more nodal areas on one side of diaphragm Stage IIR Completely resected intra- abdominal disease Stage III Two single extra nodal tumors on opposite sides of diaphragm All primary intra thoracic tumors All paraspinal or epidural tumors All extensive primary intra-abdominal disease Two or more nodal areas on opposite sides of diaphragm Stage IIIA Localized, non-resectable abdominal disease Stage IIIB Widespread multi organ abdominal disease Stage IV Initial CNS or bone marrow involvement 25 