For routine clinical practice, it is vital prior to surgery to plan the steps of the same as possible complications that may occur and how to resolve them. This case is of special interest for being a large tumor that during its resection, to make it total and facilitate healing, leaves a large defect in the skull shell.

We report two rare and infrequent cases, one of a patient with a Cognard type V tentorial dural fistula diagnosed at the beginning as a trunk glioma in a patient with gait disturbance. And another with a Guillian Barré syndrome with tetraparesis secondary to a tentorial dural arteriovenous fistula.