Anatomic study of treating petroclival lesions by posterior semicircular canal resection

ve To provide anatomic information of treating medial skull base lesions as well as preserving audition and balance by partial labyrinthectomy. Methods Surgeries was simulated on 20 adult cadaveric specimens (40 sides), and relevant data were measured. Results The distance from superior petrosal sinus to jugular bulb was (15.02 ± 3.69) mm, from sigmoid sinus to endolymphatic duct was (10.62 ± 2.09) mm, from duramater to lateral semicircular canal was (6.21 ± 1.78) mm, and from duramater to posterior semicircular canal was (4.07±1.26) mm. Conclusion It is possible to treat petroclival lesions no bigger than 1.0 cm × 1.0 cm by posterior semicircular canal resection approach. It is useless for internal auditory canal lesions.