Lateral approaches to the petroclival region

Area of Science:

• Neurosurgery
• Anatomy
• Skull Base Surgery

Background:

• The petroclival region is a complex anatomical area at the skull base.
• Lesions in this region present significant surgical challenges due to surrounding critical neurovascular structures.

Purpose of the Study:

• To review the microsurgical anatomy relevant to petroclival region lesions.
• To analyze eight distinct surgical approaches for accessing this area.
• To highlight critical anatomical considerations for surgical planning.

Main Methods:

• Anatomical review using 15 adult cadaver heads and 25 dry skulls.
• Detailed examination of eight surgical approaches: retrosigmoid, extreme lateral transcondylar, translabyrinthine, transcochlear, combined supra and infratentorial presigmoid, subtemporal anterior transpetrosal, subtemporal preauricular infratemporal, and postauricular transtemporal.
• Focus on the course of the facial nerve, internal carotid artery, and major venous pathways.

Main Results:

• Detailed anatomical descriptions for each of the eight surgical approaches were established.
• Key anatomical landmarks and potential hazards, including the facial nerve, internal carotid artery, and venous drainage, were identified for each approach.
• Considerations for selecting the most appropriate surgical approach based on lesion characteristics and anatomical variations were discussed.

Conclusions:

• A comprehensive understanding of microsurgical anatomy is essential for safe and effective management of petroclival region pathologies.
• The study provides valuable anatomical insights to guide the selection and execution of various surgical approaches to the petroclival region.
• Knowledge of the facial nerve, internal carotid artery, and venous pathways is critical for minimizing operative risks.