Intravertebral pseudomeningocele: an unusual complication after disc surgery.

Background Context: Pseudomeningoceles are most commonly the result of dural tear during spine surgery. They may sometimes slowly enlarge but they generally develop inside the spinal canal, toward the foramina or toward the surgical incision.

Purpose: To describe a late and exceptional complication of a surgical discectomy.

Target definition in the thorax and central nervous system.

It is the aim of conformal radiotherapy to restrict the high-dose region to the target volume as much as possible, thereby sparing the neighboring healthy tissues. However, to increase the therapeutic range, smaller margins tend to be used. This reduction of safety margins enhances the risk of unsuitable dosage because of mistaken target definition.