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Posterior Interhemispheric Transcallosal Intervenous/Paravenous Variant

Last Updated: January 3, 2020

Figure 1: Walter Dandy described the posterior interhemispheric transcallosal approach approximately 100 years ago for resection of pineal region tumors.

Resection of a Large Recurrent Posterior Third Ventricular Epidermoid Tumor

General Considerations

In this chapter, our specific region of interest is the posterior segment of the third ventricle. The region around the aqueduct of Sylvius and the suprapineal recess demarcate this segment. The structures composing this region include the posterior commissure, pineal body, and habenular commissure.

Figure 2: A posterior third ventricular ependymoma is illustrated. Note the overlying neurovascular structures, including the internal cerebral veins. Posterior third ventricular tumors are among the most unreachable tumors. The deep di...