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IntroductionThe bayonet congenital abnormality of cervical-thoracic spine was previously described as a rarest clinical case under the title “congenital upper spine spondylolisthesis ” (Tokgozoglu AM et all., 1994) or “congenital dislocation of the cervical spine” (Shintaki M et all., 2013) without detailed description of anatomy and principles of surgical treatment. Our series include analysis of 10 CTSI cases from 4 clinics.Material and MethodsClinical, X-ray, CT and MRI peculiarities of 10 patients aged from 1 year 8 mns till 15 years were analyzed. The repeated cervical-thoracic abnormality included antero-posterior and cranial-caudad shift of the spine into the cervical spinal canal. All patients had arcs dysplasia, but any case has a complete posterior segmental defects, MMC or split spinal cord syndrome.ResultsAccording to Frankel scale the neurological status was estimated as a type E in one patient, type D – in 4, type C - in 4 and type B in one, incl. two paraparesis and 7 tetraparesis cases. Cr...