Fig. 4From: A case report of revision occipital-cervical fusion after atlanto-axial instrumentation failure for neurofibromatosis type ISecond operation. a The anterior–posterior radiography image at the second operation. b Sagittal radiography image at the second operation. A long fixation from the occipital bone to C4 was performed. The upper atlantodental interval was 2.8 mm. c Anterior–posterior radiography image at 4 years after the second operation. d Sagittal radiography image at 4 years after the second operationBack to article page