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Asian J Neurosurg. 2012 Jan;7(1):12-6. doi: 10.4103/1793-5482.95689.

Endoscopic anatomy of the velum interpositum: A sequential descriptive anatomical study.

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1
Department of Neurosurgery, Head of MIN Unit, Kasr El-Aini School of Medicine, Cairo University, Egypt.

Abstract

BACKGROUND:

The velum interpositum and structures lying within and over it undergo morbid anatomical changes with hydrocephalus that have not been mentioned in the literature.

OBJECTIVES:

The aim of this article is to describe the diverse endoscopic anatomical findings for this surgically important region.

MATERIALS AND METHODS:

One thousand five hundred and twenty cranial endoscopic procedures performed from September 1993 till March 2011 have been retrospectively reviewed. Anatomical `situm and covering layers have been reported in 40 cases.

RESULTS:

The changes of the velum interpositum have four patterns. These are 1-Distraction mounting to disruption of layers, 2-Reverse in the normal curvature, 3-Reverse of the triangular shape with change in size, and 4-Cystic dilatation causing hydrocephalus.

CONCLUSION:

The velum interpositum and roof of the third ventricle are sites of changes associated with hydrocephalus that show specific patterns described in a sequential anatomical study.

KEYWORDS:

Endoscopic; interrpositum; velum

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