Congenital Defect of the Posterior Arch of Cervical Spine : Report of Three Cases and Review of the Current Literature

Abnormalities of the posterior arch, including congenitally absent cervical pedicle and cervical spondylolysis, are rare entities that are usually found incidentally on neck radiographs. It is important to recognize these characteristic radiological features because their radiographic appearance may cause them to be confused with more serious entities such as fractures, locked facets, and tumor-induced bony erosions. Also, it is important to distinguish these abnormalities from similar pathologies to prevent the use of inappropriate treatment. We report the relevant clinical and radiological findings seen in three cases of posterior arch defect after trauma with review of pertinent literature.

A Case of Axis Spondylolysis Causing Quadriparesis: Case Report

Cervical spondylolysis is an extremely rare abnomality of unknown etilogy, first described by Hadley. It is defined s a corticated cleft between the superior and inferior articular facets of the articular pillar, the cervical equivalent of the pars interarticularis in the lumbar spine. A 50-yar-old woman was presented with occipital headache, and pain in the upper neck region. Neurological examination revealed the patients inability to walk because of quadriparesis with mild hypesthesia in both hands and feet. The DTR was hyperactive and pathological reflexes, including Babinski's and Hoffman's, were positive bilaterally. CT showed the bilateral pars interarticularis defects and spinal canal stenosis. MRI revealed signal alteration on the upper spinal cord which was compromised due to the hypertrophied ligamentum flavum. Decompressive laminectomy of C2 was performed and the patient's neurological deficits had recovered to some extent and resulting to her ability to walk without assistance.