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Transcallosal Interforniceal Approach

Last Updated: August 6, 2018

Resection of a Large Hemorrhagic Colloid Cyst via the Transcallosal Interforniceal Approach

Indications for the Approach and Preoperative Considerations

The interforniceal approach is a variation of the transcallosal route and involves working between the columns of fornix (within the interforniceal raphe) to reach the third ventricle. I do not use this approach unless the interforniceal raphe is expanded in the presence of a cavum septum pellucidum or tumor. The associated risks of disconnecting and dissecting the normally fused forniceal bodies away from each other are significant. In my opinion, because other routes are not available, these risks are not justified.

Figure 1: Magnetic resonance images demonstrate a large hemorrhagic colloid cyst. The presence of cavum septum pellu...