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Asymptomatic cervical isthmic spondylolisthesis and associated occult spinal bifida: a case report.
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PMID:  24757456     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
We report a case of rare cervical isthmic spondylolisthesis of C6-7 combined occult spinal bifida at C6, and review the radiologic finding, different diagnosis and treatment. A 23-year old female presented nuchal, back pain after traffic accident. Radiologic finding showed the 6(th) cervical isthmic defect, spondylolisthesis and dysplasia. The patient was conservatively treated about 8 weeks, and 10 months after injury, she was symptom free with full range of motion of cervical spine and she was followed up. Cervical spondylolysis is a very rare condition. This clinical importance is vulnerable to trauma. For whatever reasons, symptomatic patients need to be treated by conservative or surgical option.
Authors:
Jeong-Wook Lim; Sang-Kuk Kang; Su-Gi Jeon; Byeong-Chul Lim
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Publication Detail:
Type:  Journal Article     Date:  2013-03-31
Journal Detail:
Title:  Korean Journal of Spine     Volume:  10     ISSN:  1738-2262     ISO Abbreviation:  Korean J Spine     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2014-04-23     Completed Date:  2014-04-23     Revised Date:  2014-04-25    
Medline Journal Info:
Nlm Unique ID:  101265383     Medline TA:  Korean J Spine     Country:  Korea (South)    
Other Details:
Languages:  eng     Pagination:  35-7     Citation Subset:  -    
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Journal Information
Journal ID (nlm-ta): Korean J Spine
Journal ID (iso-abbrev): Korean J Spine
Journal ID (publisher-id): KJS
ISSN: 1738-2262
ISSN: 2093-6729
Publisher: The Korean Spinal Neurosurgery Society
Article Information
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Copyright © 2013 The Korean Spinal Neurosurgery Society
open-access:
Received Day: 19 Month: 11 Year: 2012
Revision Received Day: 13 Month: 2 Year: 2013
Accepted Day: 07 Month: 3 Year: 2013
Print publication date: Month: 3 Year: 2013
Electronic publication date: Day: 31 Month: 3 Year: 2013
Volume: 10 Issue: 1
First Page: 35 Last Page: 37
PubMed Id: 24757456
ID: 3941735
DOI: 10.14245/kjs.2013.10.1.35

Asymptomatic Cervical Isthmic Spondylolisthesis and Associated Occult Spinal Bifida: A Case Report
Jeong-Wook Lim1
Sang-Kuk Kang2
Su-Gi Jeon1
Byeong-Chul Lim1
1Department of Neurosurgery, Daejeon Sun Hospital, Daejeon, Korea.
2Department of Rehabilitation Medicine, Daejeon Sun Hospital, Daejeon, Korea.
Correspondence: Corresponding Author: Jeong-Wook Lim, MD. Department of neurosurgery, Daejeon Sun General Hospital, 10-7 Mok-dong, Jung-Gu, Daejeon 301-725, Korea. Tel: +82-42-220-8850, Fax: +82-42-220-8850, magicdoctor@hanmail.net

INTRODUCTION

Cervical spine spondylolysis is the most commonly caused by high energy trauma to the upper cervical spine in the form of a "hangman's" fracture of C2 vertebrae7). However, congenital cervical spine spondylolysis is discovered by incidental radiographic finding, neck pain after minor trauma, a clunking or clicking neck and rarely neurologic compromise1-3,6,8,10). This rare condition potentially signifies an unstable cervical spine.

We will report a case of congenital isthmic defect of cervical spine and describe a cause of cervical isthmic defect, diagnostic radiographic finding and appropriate treatment of cervical spondylolysis or spondylolithesis.


CASE REPORT

A 23-year-old female suffered from a hyperextension injury to cervical spine after a traffic accident. Following this injury, she experienced mild to moderate degree of nuchal and back pain. She had no neurological symptoms or signs. There was no history of significant illness or trauma in the past.

Plain radiograph of the cervical spine showed bilateral pars interarticularis defect at the C6 level with cleft-bow-tie configuration, hypoplastic pedicle, grade I spondylolisthesis of C6 on C7 and spinal bifida at C6 (Fig. 1). Computed tomography of the C6 vertebrae showed bilateral corticated defects of the C6 articular mass, bilateral hypoplastic pedicles, lamina and spinal bifida of C6 and apparent neural foraminal enlargement at C6-7 (Fig. 2). The magnetic resonance image of spine showed grade I spondylolisthesis C6-7, degenerative change of C6-7 disc and acute compressed fracture at 4th thoracic vertebrae. She was subjected to controlled flexion-extension views of the cervical spine, which confirmed stability of the segment with less than 10 degrees of anterior angulations (Fig. 3). The cervical spine was stable on lateral flexion and extension radiography.

She was treated with the semihard-orthosis brace immobilization for 8 weeks followed by repeated lateral cervical spine radiography. After 10 months to injury, she was symptom free with full range of motion of cervical spine.


DISCUSSION

Reported cervical spondylolysis are incidentally discovered except the "Hangman's" fracture1-3,6,8,9,10). Cervical spondylolysis is less prevalent than lumbar spondylolysis, only about 100 cases have been reported in the literature worldwide, mainly in adults1). There is often no clear uniform mechanism of the injury, or the force causing the injury is often not strong enough to explain all of observed cervical anomaly. Incidentally discovered cervical spondylolysis could combine with another anomaly like spinal bifida, dysplastic lamina or transverse process (Table 1).

The etiology of cervical spondylolysis is unknown, but congenital basis is asserted because no history of trauma is elicited in the majority of cases2,3,5). Another basis is nonunion of vertebra after birth, infantile fracture or repetitive microtrauma1,6,9). Moore described the five secondary ossification centers that form after birth5). The vertebral body will articulate with the vertebral arch at the neurocentral joints at birth, with fusion occurring between the ages of 5 and 8 years5,7). If congenital defect is invalid, problem of ossification or chondrification might occur during vulnerable period from birth to fusion at neurocentral joint. Morvan et al. proposed that this condition was caused by repetitive microtrauma resulting in stress fractures to the pars region similar to the process proposed in lumbar spondylolysis5). They further proposed C6 to be the commonest site to be affected as, this being a transitional vertebra, it was subjected to stress more often. Some of these theories can be put together and it may be suggested that a dysplastic spine is more susceptible to trauma or stress and leads to spondylolysis6). We could clarify that our case was associated with congenital basis because of well corticated margin in defected area combined with another congenital lesion and no trauma history. Congenital cervical spondylolysis, an embryologic developmental defect, occurs the most commonly at C61,2,6,9,10). The overall frequency is unknown, and most cases are detected incidentally (Table 1)

Conventional radiolographic findings of cervical spondylolysis included a deformed articular mass, hypoplastic or dysplastic pedicle, spinal bifida and anterolisthesis1-3,6,8-10). The computed tomography is the most useful image modality, because it shows the exact bony structures and three dimensional images. The magnetic resonance image could help to distinguish between traumatic and congenital cause9). The magnetic resonance image can aid identification of combined soft tissue damage, cord injury and bony contusion at trauma lesion. However, magnetic resonance image is not useful for diagnosis of cervical spondylolysis. In our case, cervical magnetic resonance image showed acute compressive fracture at 4th thoracic vertebrae and degenerative disc change.

Misdiagnosis occurred for traumatic unilateral interfacet dislocation, a chronic nonunited articular mass fracture or congenitally absent pedicle4,10). These disease entities could be distinguished by computer tomography. For example, unilateral interfacet dislocation is characterized by spondylolisthesis greater than 3mm, rotation without a superimposed articular mass, and misalignment of the spinous process4).

The cervical spondylolysis can cause variable symptoms like neck pain, muscle spasm or neurologic deficit. Symptomatic cervical spondylolysis need adequate treatment because previously existing cervical spondylolysis is vulnerable to trauma.

The treatment of cervical spondylolysis depends on instability. If the cervical spine is stable, conservative approach is desirable for treating symptomatic cervical spondylolysis. If it is in unstable status, surgical fixation can be needed. Our case was stable but needed hard orthosis because of the fracture of 4th thoracic vertebrae.


CONCLUSION

Cervical spondylolysis is a very rare condition. Its clinical importance is vulnerability to trauma. The etiology of cervical spondylolysis is still a controversy. Computer tomography and plain film are useful diagnostic image modality.

For whatever reasons, symptomatic patients need to be treated by conservative or surgical option. Giving more attention to cervical spondylolysis will help further exact diagnosis and appropriate therapy.


References
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2. Forsberg DA,Martinez S,Vogler JB 3rd,Wiener MD. Cervical spondylolysis: imaging findings in 12 patientsAJR Am J RoentgenolYear: 19901547517552107670
3. Howard AW,Letts RM. Cervical spondylolysis in children: Is it posttraumatic?J Pediatr OrthopYear: 20002067768111008752
4. Kalayci M,Cagavi F,Acikgoz B. Unilateral cervical facet fracture: presentation of two cases and literature reviewSpinal CordYear: 20044246647215112000
5. Kaplan KM,Spivak JM,Bendo JA. Embryology of the spine and associated congenital abnormalitiesSpine JYear: 2005556457616153587
6. Morvan G,Busson J,Frot B,Nuhum H. Cervical spondylolysis. 7 cases. review of the literatureJ RadiolYear: 1984652592666384499
7. Parisi M,Lieberson R,Shatsky S. Hangman's fracture or primary spondylolysis: a patient and a brief reviewPediatr RadiolYear: 1991213673681891266
8. Choi YM,Han YM. Cervical spondylolysis: report of two casesJ Korean Neurosurg SocYear: 2004364337379
9. Redla S,Sikdar T,Saifuddin A,Taylor BA. Imaging features of cervical spondylolysis--with emphasis on MR appearanceClin RadiolYear: 19995481582010619298
10. Sheehan J,Kaptain G,Sheehan J,Jane J Sr. Congenital absence of a cervical pedicle: report of two cases and review of the literatureNeurosurgeryYear: 2000471439144211126916

Article Categories:
  • Case Report

Keywords: Cervical Vertebrae, Spondylolysis, Spondylolisthesis, Spinal bifida.

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