The trigeminal nerve is often displaced by petroclival meningioma (PCM) compression, making it difficult to locate during PCM surgery. This study investigated whether the deviated position of the trigeminal nerve could be easily predicted using the main tumor feeding artery. We retrospectively examined 32 patients who underwent surgery for primary PCM. The deviation of the trigeminal nerve was classified as either Type 1 (displacement toward the back of the cerebellar tentorium), Type 2 (toward the back of the superior petrosal sinus), Type 3 (toward the back of the petrous apex dura), Type 4 (toward the inferior aspect of the tumor), or Type 5 (toward the surface of the brain stem). The main feeding artery was determined by preoperative angiography. The trigeminal nerve was classified as Type 2 in 60% of cases where the proximal tentorial artery (TA) was the main feeding vessel. The nerve was Type 5 where the distal portion of the TA was the main feeding vessel (60% of the cases). The nerves were Type 3 and Type 4 where the proximal inferior lateral trunk (ILT) (60%) and distal ILT (75%), respectively, were the main feeding vessels. In 66.7% of the cases where the dorsal meningeal artery was the main feeding vessel, the nerve was Type 3. Type 1 classification applied in all cases where the ascending pharyngeal artery was the main feeding artery. The main feeding artery can be used to predict trigeminal nerve transposition during PCM surgery.

中文翻译：

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石油斜坡脑膜瘤中基于主要供血动脉的三叉神经位置预测。

三叉神经经常被岩斜脑膜瘤（PCM）压迫而移位，因此在PCM手术中很难定位。这项研究调查了是否可以使用主肿瘤供血动脉轻松预测三叉神经的偏斜位置。我们回顾性检查了32例接受原发性PCM手术的患者。三叉神经的偏斜分为1型（向小脑腱后侧移位），2型（向上睑窦窦向后），3型（向岩顶硬脑膜后方），3型。 4（朝向肿瘤下侧）或5型（朝向脑干表面）。通过术前血管造影术确定主供血动脉。在近端伸张动脉（TA）为主要供血血管的病例中，有60％将三叉神经分类为2型。神经是5型神经，其中TA的远端是主要的供血血管（占病例的60％）。神经为3型和4型，其中近侧下躯干（ILT）（60％）和远侧ILT（75％）是主要的供血血管。在背脑膜动脉为主要供血血管的病例中，有66.7％的神经为3型。在咽咽动脉为主要供血动脉的所有病例中，均采用1型分类。主进动脉可用于预测PCM手术期间的三叉神经移位。神经为3型和4型，其中近侧下躯干（ILT）（60％）和远侧ILT（75％）是主要的供血血管。在背脑膜动脉为主要供血血管的病例中，有66.7％的神经为3型。在咽咽动脉为主要供血动脉的所有病例中，均采用1型分类。主进动脉可用于预测PCM手术期间的三叉神经移位。神经为3型和4型，其中近侧下躯干（ILT）（60％）和远侧ILT（75％）是主要的供血血管。在背脑膜动脉为主要供血血管的病例中，有66.7％的神经为3型。在咽咽动脉为主要供血动脉的所有病例中，均采用1型分类。主供血动脉可用于预测PCM手术期间的三叉神经移位。