Medial Loop of V2 Segment of Vertebral Artery Causing Compression of Proximal Cervical Root.
10.3340/jkns.2012.52.6.513
- Author:
Sung Bae PARK
1
;
Hee Jin YANG
;
Sang Hyung LEE
Author Information
1. Department of Neurosurgery, Seoul National University Boramae Medical Center, Seoul, Korea. nsyang@brm.co.kr
- Publication Type:Original Article
- Keywords:
Vertebral artery;
Medial loop;
Spine
- MeSH:
Humans;
Incidence;
Magnetic Resonance Imaging;
Medical Records;
Radiculopathy;
Retrospective Studies;
Spinal Cord;
Spine;
Vertebral Artery
- From:Journal of Korean Neurosurgical Society
2012;52(6):513-516
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: It is rare that the medial loop in the V2 segment of the vertebral artery (VA) causes compression of the proximal cervical root of the spinal cord without leading to bony erosion and an enlarged foramen. We evaluated the clinical significance and incidence of the medial loop in the V2 segment of the VA. METHODS: We reviewed the records from 1000 consecutive patients who had undergone magnetic resonance imaging evaluation of the cervical spine between January 2005 and January 2008. The inclusion criteria were that over a third of the axial aspect of the VA located in the intervertebral foramen was inside the line between the most ventral points of the bilateral lateral mass, and that the ipsilateral proximal root deviated dorsally because of the medial loop of the VA. We excluded cases of bone erosion, a widened foramen at the medial loop of the VA, any bony abnormalities, tumors displacing VA, or vertebral fractures. The medical records were reviewed retrospectively to search for factors of clinical significance. RESULTS: In six patients (0.6%), the VA formed a medial loop that caused compression of the proximal cervical root. One of these patients had the cervical radiculopathy that developed after minor trauma but the others did not present with cervical radiculopathy related to the medial loop of the VA. CONCLUSION: The medial loop of the VA might have a direct effect on cervical radiculopathy. Therefore, this feature should be of critical consideration in preoperative planning and during surgery.
