Mr. F was a veteran construction worker living with his wife and two children when, in 1989, he developed severe back pain and rapid onset of paresthesias, pain, and limited mobility in his lower extremities. He was diagnosed with a primary spinal epidural non-Hodgkin's lymphoma (NHL) and underwent laminectomy to relieve spinal compression. But the nerve damage was severe and Mr. F continued to experience peripheral neurological deficits, including persistent pain.