Approach Of Surgical Planning Of The Microvascular Decompression For Cranial Nerve

Objective:To provide anatomic data for the surgical planning of the microvascular decompression for treatment of trigeminal neuralgia,hemifacial spasm,and glossopharyngeal neuralgia,with minimal risk of postoperative cranial nerve palsy. Methods: 10 cadaver heads were examined and anatted with operating microscope. Respectively use the lateral suboccipital posterosigmoid sinuses approach to access the trigeminal nerve in the superior portion of the cerebellopontine angle through the lateral aspect of the cerebellar tentorial surface;the lateral suboccipital approach is directed through the inferior part of the cerebellar petrosal surface to reach the root exit zone of the facial nerve below the floculus;the suboccipital transcondylar fossa approach is used to access the glossopharyngeal nerve in the inferor portion of the cerebellopontine angle through the cerebellar suboccipital surface. Results:the greatest advantage of the differential selection of the surgical approach is increased ability to reach thr destination in the cerebellopontine angle accurately,with minimal risk of postoperative cranial nerve palsy.