Congenital craniovertebral junction anomalies: The issues

[1],[2] Arnold Chiari Malformation The basic pathology of ACM, accepted worldwide, is that of small posterior fossa volume. [...]foramen magnum decompression is a well-accepted surgical procedure for treating ACM. [...]ACM with demonstrable instability is rarely seen. The relationship of C1 and C2 could not be studied well in all dimensions on plain radiographs or on polytomography. [...]the high position of odontoid due to clival or occipital condylar hypoplasia or due to AAD could not be seen. If there is some rotation at the atlanto-axial joint, the sagittal and coronal section will not show the real relationship between the facets of these vertebrae. [...]the surgeon himself should study the three-dimensional reconstruction images by rotating them in all directions.