MRI features of epidural lipomatosis compressing the thecal sac at L5-S1 with a "Y" shape configuration in a patient with moderate spinal canal stenosis (grade 2), according to lumbar spinal stenosis (grading).

The epidural lipomatosis involves mainly the lower lumbar and/or lower thoracic region.  Compression of the thecal sac may be symptomatic with a combination of pain, radicular symptoms, weakness and anesthesia.