Microsurgical Resection of a Meningioma at the Entrance of Dorello's Canal Causing VI Cranial Nerve Compression: 2-Dimensional Operative Video.

We describe the case of a 73-yr-old female patient with a 2-yr history of diplopia that has progressively become worse. Physical examination revealed a right VI cranial nerve (CN) palsy. Magnetic resonance imaging and angiography showed a dolichoectatic basilar artery near the VI CN. A suboccipital craniectomy was performed, initially with the intention to perform a microvascular decompression; however, a red mass was encountered at the entrance of the right Dorello's canal that was compressing the VI CN. Complete resection of the lesion was done and decompression of the nerve was accomplished. In the following video illustration, we narrate this operative case and highlight the nuances of this approach. Patient consent was obtained for the submission of the video to this journal.