Abstract
Objective To quantitatively compare the exposure areas and angles in anterior subtemporal keyhole approach to superior petroclival region before and after cranial cisterns opening. Methods The study was carried out on 20 sides of cadaver heads. With application of a navigation system, the exposure area in superior clivus, the ventrolateral area in brain stem around BA, the linear exposure of the posterior petroclinoid fold and BA trunk, and the approach angles to BA tip were evaluated. Results The exposure area in superior clivus （ 136. 7 ± 19. 8 ） mm^2, the ventrolateral area in brain stem （ 222. 8 ± 25.8 ） mm^2, the linear exposure of the posterior petroclinoid fold （ 11.5 ±0. 6 ） mm, and BA trunk （10. 3± 2.0 ）mm, and the approach angles in the vertical axis to BA tip（ 13.7 ± 1.7 ）°were significantly greater after opening cranial nerve cisterns. But the approach angles in the horizontal axis to BA tip were indifferent. Conclusions The exposure areas and angles of anterior subtemporal keyhole approach to superior petroclival region can be increased after opening cranial nerve cisterns. Key words: Subtemporal; Keyhole approach; Cranial nerve cisterns ; Superior petroclival region
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