Intradural spinal lipoma of the cervical cord.

Intraspinal subdural lipomas are rare tumors of the spinal canal. Such tumors occur in the thoracic and cervical region; however, extension into the posterior fossa and fourth ventricle is most unusual. We describe two children, an infant and a teenager, with progressive neurologic deficit from such a lipomatous tumor. The lipoma in the infant extended into the lower fourth ventricle and caused ventricular obstruction.