Epidural venography in the diagnosis of lumbar spinal stenosis.

Epidural venography is valuable in diagnosing lumbar spinal stenosis. It shows anterior displacement of the posterior medial longitudinal intervertebral veins at the level of the lamina and the superior and inferior articular facets. This results in decreased distance between and sometimes overlapping of the posterior and anterior medial longitudinal intervertebral veins. Three cases of spinal stenosis diagnosed by epidural venography are presented.