An 8-year-old boy with Burkitt's lymphoma and diffuse marrow involvement. Fat-suppressed, T2-weighted fast spin echo (3000/96, TR/TE) sagittal MR image of the lumbar spine shows heterogeneous signal intensity of the bone marrow and epidural extension of tumor (arrowheads) at the level of L5 and L2, with apparent preservation of the vertebral cortex.