• Ayhan Comert, Ihsan Dogan, Niymet Pelin Cavdar Yilmaz, Yigit Gungor, Yagmur Bekdemir, Goktug Kubat, Selin Gurpinar, Mustafa Bugra Basarmak, Batuhan Asan, Dicle Gul, and Derya Gokmen.
• Department of Anatomy, School of Medicine, Ankara University, Ankara, Turkey. Electronic address: comertayhan@yahoo.com.
• World Neurosurg. 2024 Jan 1; 181: e84e93e84-e93.

PurposeThe exhaustive information regarding the types of trigeminal pore (TP) or trigeminal impression (TI), internal acoustic opening (IAO), and related surgical approaches is lacking in the literature. Therefore, this study is performed to further elucidate the types of TP or TI, IAO, and the relationships with critical surgical landmarks in the skull base.MethodsTrigeminal impression (TI) and internal acoustic opening (IAO) found in 11 dry skulls, 24 right temporal bones, and 25 left temporal bones were examined on both sides to define their relationship to each other and nearby structures. The age and sex of these bones were not identified. Besides these, 77 skulls were examined by radiologic imaging methods. These skulls were identified by gender.ResultsAccording to test results, there was a significant difference between the left and right internal acoustic opening in the case of horizontal dimension (HD). The left HD-IAO is bigger than the right one. In addition, right HD-IAO, vertical dimension (VD) of right internal acoustic opening, left HD-IAO, and left VD-IAO values differed significantly in male and female patients.ConclusionsInvestigating the relationship of TI and IAO with relevant structures suggests that surgical approaches involving the TP and IAO indicated that surgical approaches considering the TI and IAO variations may be used in the development of surgical processes and primary surgical interventions.Copyright © 2023 Elsevier Inc. All rights reserved.

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