Intraventricular meningiomas (IVMs) of the lateral ventricle are rare tumors that present surgical challenges because of their deep location. Visual field deficits (VFDs) are one risk associated with these tumors and their treatment. VFDs may be present preoperatively due to the tumor and mass effect (tumor VFDs) or may develop postoperatively due to the surgical approach (surgical VFDs). This institutional series aimed to review surgical outcomes following resection of IVMs, with a focus on VFDs.

Patients who received IVM resection at one academic institution between the years 1996 and 2021 were retrospectively reviewed. Diffusion tensor imaging (DTI) reconstructions of the optic radiations around the tumor were performed from preoperative IVM imaging. The VFD course and resolution were documented.

Thirty-two adult patients underwent IVM resection, with gross-total resection in 30 patients (93.8%). Preoperatively, tumor VFDs were present in 6 patients, resolving after surgery in 5 patients. Five other patients (without preoperative VFD) had new persistent surgical VFDs postoperatively (5/32, 15.6%) that persisted to the most recent follow-up. Of the 5 patients with persistent surgical VFDs, 4 received a transtemporal approach and 1 received a transparietal approach, and all these deficits occurred prior to regular use of DTI in preoperative imaging.

New surgical VFDs are a common neurological deficit after IVM resection. Preoperative DTI may demonstrate distortion of the optic radiations around the tumor, thus revealing safe operative corridors to prevent surgical VFDs.

侧脑室内脑膜瘤（IVM）是一种罕见的肿瘤，由于其位置较深，给手术带来了挑战。视野缺陷（VFD）是与这些肿瘤及其治疗相关的风险之一。 VFD 可能因肿瘤和占位效应而在术前出现（肿瘤 VFD），也可能因手术入路而在术后出现（手术 VFD）。该机构系列旨在回顾 IVM 切除后的手术结果，重点关注 VFD。

对 1996 年至 2021 年间在一家学术机构接受 IVM 切除的患者进行回顾性分析。根据术前 IVM 成像对肿瘤周围的视辐射进行弥散张量成像 (DTI) 重建。 VFD 过程和解决方案均已记录。

32 名成年患者接受了 IVM 切除术，其中 30 名患者进行了大体全切除（93.8%）。 6 名患者术前存在肿瘤 VFD，5 名患者术后消失。其他 5 名患者（术前没有 VFD）术后出现新的持续性手术 VFD（5/32，15.6%），并且持续到最近的随访。在 5 例持续存在手术 VFD 的患者中，4 例接受了经颞叶入路，1 例接受了经顶叶入路，所有这些缺陷都发生在术前成像中常规使用 DTI 之前。

新的手术 VFD 是 IVM 切除后常见的神经功能缺损。术前 DTI 可能会显示肿瘤周围视辐射的扭曲，从而揭示安全的手术通道以防止手术 VFD。