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Five fresh\u2010frozen anonymized adult human cadavers were operated on using an endoscope with an oval shaft cross\u2010section with a diameter of 9.3\u2009mm, a working length of 177\u2009mm, and a viewing angle of 20<jats:bold>\u00b0<\/jats:bold>. It also had an eccentric working channel with a diameter of 5.6\u2009mm, a light guide, a sheath for continuous irrigation, and a rod lens system. The instruments were introduced from the working channel. Posterior craniocervical structures were dissected, and PFD was achieved. The planned steps were performed in all five cadavers. The endoscope was introduced to the posterior craniocervical region, dissecting the structures to easily expose the suboccipital bone and C1 posterior arch. Important structures, such as the C1 posterior tubercle, rectus capitis posterior minor muscles, and posterior atlantooccipital membrane, were used as landmarks. PFD was feasible even with the dural opening. Using the full\u2010endoscopic approach, posterior craniocervical structures can be reached, and PFD can be performed successfully. The instruments used are well\u2010defined for spinal usage; thus, this full\u2010endoscopic technique can be widely used in the surgical treatment of patients with CM\u2010I.<\/jats:p>","DOI":"10.1002\/ca.24024","type":"journal-article","created":{"date-parts":[[2023,2,14]],"date-time":"2023-02-14T14:01:46Z","timestamp":1676383306000},"page":"660-668","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Full\u2010endoscopic technique for posterior fossa decompression in Chiari malformation type I: An anatomical feasibility study in human cadavers"],"prefix":"10.1002","volume":"36","author":[{"given":"I.","family":"Dolas","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Istanbul Faculty of Medicine Istanbul University  Istanbul Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A. 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