Acta Neurochirurgica

, Volume 120, Issue 3–4, pp 155–158 | Cite as

Conjoined lumbosacral nerve roots

  • J. G. Gomez
  • J. W. Dickey
  • T. B. Bachow
Clinical Articles


Conjoined lumbosacral nerve roots is a congenital anomaly that may produce lumbosciatic pain. When symptomatic and undiagnosed, it may be one of the causes of failed back syndrome. Diagnosis with water-soluble contrast myelography has a frequency of 4%. Anatomical studies have shown to have an incidence of 14%.

High quality Magnetic Resonance Imaging (MRI) with coronal views may reveal this condition without recurring to computed tomography (CT)-myelography. In this paper we describe our recent experience with five consecutive cases observed during a one year period.


Myelography MRI conjoined nerve roots lumbosacral 


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  1. 1.
    Cail W, Butler A (1983) Conjoined lumbosacral nerve roots. Diagnosis with metrizamide myelography. Surg Neurol 20:113–119CrossRefPubMedGoogle Scholar
  2. 2.
    Cannon BW, Hunter SE, Picaza JA (1962) Nerve root anomalies in lumbar disc surgery. J Neurosurg 19: 208–214PubMedGoogle Scholar
  3. 3.
    Ethelberg S, Riishede J (1952) Malformation of the lumbar spinal roots and sheaths in the causation of low backache and sciatica. J Bone J Surg 34 B: 442–446Google Scholar
  4. 4.
    Gambardella A, Simari Benigno R, Mazz Met al (1985) Le anomalie della emergenza radicolari lumbosacrali. Radio Med 71: 36–39Google Scholar
  5. 5.
    Gebarski SS, McGillicuddy JE (1984) Conjoined nerve roots: a requirement for computed tomographic and myelographic correlation for diagnosis. Neurosurgery 14: 66–68PubMedGoogle Scholar
  6. 6.
    Goffin J, Plets C (1987) Unusual combination of anomalies of lumbar nerve roots. Acta Anat 128: 161–163PubMedGoogle Scholar
  7. 7.
    Goffin J, Plets C (1987) Association of conjoined and anastomosed nerve roots in the lumbar region. Clin Neurol Neurosurg 89: 117–120CrossRefPubMedGoogle Scholar
  8. 8.
    Gomez JG, Ruiz E, Spitale Ret al (1985) Conjoined lumbosacral roots. Neuro Col (Bogota) 9: 140–142Google Scholar
  9. 9.
    Gomez JG (1991) MRI of the nervous system. (Spa) McGraw Hill-Interamericana, Madrid, pp 167 and 171Google Scholar
  10. 10.
    Helms CA, Dorwart RH, Gray M (1982) The CT appearance of conjoined nerve roots and differentiation from a herniated nucleus pulposus. Radiology 144: 803–807PubMedGoogle Scholar
  11. 11.
    Hoddick WK, Helms CA (1985) Bony spinal changes that differentiate conjoined nerve roots from herniated nucleus pulposus. Radiology 154: 119–120PubMedGoogle Scholar
  12. 12.
    Kaddish L, Simmons E (1984) Anomalies of the lumbosacral nerve roots. An anatomical investigation of myelographic study. J Bone J Surg 66 B: 411–416Google Scholar
  13. 13.
    Mauri F, Gambardella A (1989) Anomalies of the lumbosacral nerve roots. Neurol Res 11: 130–135PubMedGoogle Scholar
  14. 14.
    Neidre A, MacNab I (1983) Anomalies of the lumbosacral nerve roots. Review of 16 cases and classification. Spine 8: 294–299PubMedGoogle Scholar
  15. 15.
    Pecker J (1974) L'acolement en canon de fusil des racines rachidiennes, piege diagnostique. Nouv Pres Med 13: 1155–1156Google Scholar
  16. 16.
    Peyster RG, Teplick JG, Haskin ME (1985) Computed tomography of lumbosacral conjoined nerve root anomalies. Potential cause of false positive reading for herniated nucleus pulposus. Spine 10: 331–337PubMedGoogle Scholar
  17. 17.
    Postacchin F, Urso S, Ferro L (1982) Lumbosacral nerve root anomalies. J Bone J Surg 64 A: 721–729Google Scholar
  18. 18.
    Rosner M, Whaley R (1984) Anomalous exit of the C-6 nerve root via the C6-7 foramen. Neurosurgery 14: 740–743PubMedGoogle Scholar
  19. 19.
    Torricelli P, Spina V, Martinelli C (1987) CT diagnosis of lumbosacral conjoined nerve roots. Findings in 19 cases. Neuroradiology 29: 374–379CrossRefPubMedGoogle Scholar
  20. 20.
    White JG, Strait TA, Binkley JRet al (1982) Surgical treatment of 63 cases of conjoined nerve roots. J Neurosurg 56: 114–117PubMedGoogle Scholar

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • J. G. Gomez
    • 1
  • J. W. Dickey
    • 1
  • T. B. Bachow
    • 2
  1. 1.Department of Surgery, Division of Neurological SurgeryHoly Cross HospitalFt. LauderdaleUSA
  2. 2.Department of RadiologyHoly Cross HospitalFt. LauderdaleUSA

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