How would you define your radiation treatment volume for a primary diffuse large B-cell lymphoma of the L4 vertebral body that had a complete response to chemotherapy?

For a primary DLBCL involving only the L4 vertebral body with a CR after chemotherapy, we would include just the involved L4 vertebral body. There is no need to include one vertebral body above and below. Effort should be made to reduce excess dose to the bowel and adjacent bone marrow with either a...