V2 Vertebral Artery Transposition for Microvascular Decompression of C5 Nerve Root: A 2-Dimensional Operative Video.

Abstract

Vertebral artery tortuosity is a common phenomenon with an estimated incidence of 2.7%. However, it is symptomatic in very rare instances, with only 21 cases reported in the literature. When a neurovascular conflict can be clearly identified, microsurgical decompression should be the treatment of choice. This can be performed through a variety of different strategies which can achieve either direct or indirect decompression. We present the case of a 68-year-old female who suffered from progressive right-sided C5 radiculopathy and deltoid weakness for over a year secondary to a neurovascular conflict between a V2 vertebral artery loop and the C5 nerve root. Microvascular decompression with vertebral artery transposition using an anterolateral approach was recommended for pain management and arrest of her neurological deficit, and the patient consented to the procedure. Institutional Review Board approval was not necessary given that this treatment was necessary and indicated. The longus colli is mobilized, and the anterior wall of the foramen transversarium is exposed. The foramen transversarium is drilled to unroof the vertebral artery. The neuroforamen is identified. A tailored foraminotomy is performed to expose the neurovascular conflict. The vertebral artery loop is dissected away from the C5 nerve root and transposed outside the neuroforamen. The transposition is maintained with Teflon felts. The patient had immediate resolution of her pain and weakness. Surgeons should be aware of this rare cause of radiculopathy and should be familiar with the surgical technique for vertebral artery mobilization. Direct decompression should be the goal of treatment when possible.