On gabapentin treatment for chronic (neuropathic?) back pain. "CT-proven" lumbar discopathy according to patient. Difficulty walking for past day, describes bilateral leg weakness.

Physical examination remarkable for a slightly wide based gait and mildly decreased anal sphincter tone.

CT lumbar spine showed a proliferation of epidural fat enveloping and compressing the thecal sac, which could explain the chronic back pain and perhaps the new mild symptoms as well.