Dural arteriovenous malformation of the major venous sinuses: an acquired lesion.

Arteriovenous malformations of the dura are thought to be congenital. However, arteriographic investigations of four patients who, after a head injury, developed dural arteriovenous fistulae with features of congenital malformations suggest that these abnormal communications may also be acquired. Thrombosis or thrombophlebitis in the dural sinus or vein may be the primary event in their formation.

Multiple spinal canal meningiomas.

Three cases of multiple spinal canal meningiomas are presented, bringing the total number of documented cases in the American literature to nine. While the exact incidence of multiple spinal meningiomas is difficult to determine, their possible occurrence warrants careful myelographic examination of the whole spinal canal, particularly if multiple clinical levels are present. When a complete block to the contrast agent is encountered, myelography should also be carried out via an upper cervical puncture.

Communicating hydrocephalus following total parenteral nutrition.

Communicating hydrocephalus secondary to cerebral venous outflow obstruction has been reported in a few patients several months following removal of a TPN catheter. We report the case of an infant who developed this sequal 4 mo after the catheter was removed. We illustrate the techniques used to delineate the type of hydrocephalus.