Vertebral Artery Mobilization and Cervical Tumor Resection

Surgical Strategy for Dumbbell-Shaped Cervical Schwannoma at the Vicinity of the Vertebral Artery: The Utilization of Anatomic Layer

BACKGROUND AND OBJECTIVES

In cases where dumbbell-shaped cervical schwannoma encases the vertebral artery (VA), there is a risk of VA injury during surgery. The objective of this study is to propose a strategy for preserving the VA during the surgical excision of tumors adjacent to the VA through the utilization of anatomic layers.

METHODS

A retrospective analysis was conducted on 37 patients who underwent surgery for dumbbell-shaped cervical schwannoma with contacting VA from January 2004 to July 2023. The VA encasement group consisted of 12 patients, and the VA nonencasement group included 25 patients.

RESULTS

The perineurium acted as a protective barrier from direct VA exposure or injury during surgery. However, in the VA encasement group, 1 patient was unable to preserve the perineurium while removing a tumor adjacent to the VA, resulting in VA injury. The patient had the intact dominant VA on the opposite side, and there were no new neurological deficits or infarctions after the surgery. Gross total resection was achieved in 25 patients (67.6%), while residual tumor was confirmed in 12 patients (32.4%). Four patients (33.3% of 12 patients) underwent reoperation because of the regrowth of the residual tumor within the neural foramen. In the case of the 8 patients (66.7% of 12 patients) whose residual tumor was located outside the neural foramen, no regrowth was observed, and there was no recurrence of the tumor within the remaining perineurium after total resection.

CONCLUSION

In conclusion, when resecting a dumbbell-shaped cervical schwannoma contacting VA, subperineurium dissection prevents VA injury because the perineurium acts as a protective barrier.

Embolization of a vertebral artery encased in a regrowth cervical meningioma before resection

Background:

Managing intraoperative bleeding may be challenging when a cervical tumor encases the vertebral artery (VA). Here, a patient with a recurrent cervical meningioma between the C1/2 and C3/4 levels and encasement of the right VA injury developed intraoperative bleeding that was endovascularly embolized postoperatively.

Case Description:

A 30-year-old female presented with a progressive quadriparesis, most markedly involving the right upper extremity. Six years ago, she had a cervical meningioma resected at the C2/3 level. The new MR revealed regrowth of intraspinal tumor between the C1/2 to C4/5 levels accompanied by extradural encasement of the right VA within the C2/3 and C3/4 foramina. Before the first surgery, the right VA was embolized (i.e., after a balloon occlusion test proved negative). During the attempted resection of the intradural/extradural tumor, bleeding from the right VA was encountered; it was temporarily controlled. After complete occlusion of the right VA was angiographically confirmed, a second-stage procedure to fully resect the extradural remanent of the tumor was undertaken.

Conclusion:

Endovascular embolization of the right VA before the attempted resection of a recurrent intraspinal/extraspinal cervical meningioma failed to occlude the vessel entirely. The VA bleeding encountered intraoperatively was temporarily controlled. Delayed total VA occlusion was angiographically observed before full tumor resection could be completed.