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Congenital Absence of the Posterior Arch of the Atlas – A Strange but Benign Anomaly

Tan, E.C., and Soon, H.C., and Kevin, M., and Se To, B.C., (2007) Congenital Absence of the Posterior Arch of the Atlas – A Strange but Benign Anomaly. Malaysian Orthopaedic Journal, 1 (2). pp. 30-32. ISSN 1985 2533

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Official URL: http://www.morthoj.org/2007v1n2/Congenital_Absence_of_the_Posterior_Arch_of_the_Atlas.pdf

Affiliations

Penang Hospital, Dept. of orthopaedics and traumatology
Penang Hospital, Dept. of orthopaedics and traumatology
Penang Hospital, Dept. of orthopaedics and traumatology
Penang Hospital, Dept, of orthopaedics and traumatology

Abstract

Congenital partial aplasia of the atlas with a posterior arch remnant is rare. It may be found as an incidental radiological finding or patients can present with neurological signs and symptoms after head or neck trauma. A 36-year-old female presented with a 3-day history of right sided neck pain radiating down the right arm. Radiographs of the cervical spine showed a radiolucent area in the region of the posterior arch of the atlas. Computed tomography subsequently revealed partial absence of the posterior arch of the atlas with a defect at the anterior ring. Her clinical condition subsequently improved with rest, analgesia and physiotherapy. This case report illustrates a situation where congenital defect of the posterior arch of the atlas was revealed in a patient with neck pain. Awareness of the existence of this condition will help clinicians avoid misdiagnosis and excessive investigations.

Item Type:Journal
Keywords:Posterior arch of the Atlas, Congenital absence, Posterior tubercle
Subjects:R Medicine, Dentistry, Pharmacy, Nursing
ID Code:7309

1. Sharma A, Gaikwad SB, Deol PS. Partial aplasia of the posterior arch of the atlas with an isolated posterior arch remnant: findings in three cases. AJNR Am J Neuroradiol. 2000; 21:1167-1171.

2. Atasoy C, Fitoz S, Karan B. A rare cause of cervical spinal stenosis: posterior arch hypoplasia in bipartite atlas. Neuroradiology. 2002; 44:253-255.

3. Curriano G, Rollings N, Diehl JT. Congenital defects of the posterior arch of the atlas: a report of seven cases including an affected mother and son. AJRN Am J Neuroradiol. 1994; 15: 249-54.

4. Klimo P, Blumenthal DT, Couldwell WT. Congenital partial aplasia of posterior arch of the atlas causing myelopathy: Case report and review of the literature. Spine. 2003; 28: 224-8.

5. Garg A, Gaikwad SB, Gunta B, Mishra MK. Bipartite atlas with os odontoideum. Spine. 2004; 29: 35-8.

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