Twenty-seven patients with definite or probable CPPS have been investigated with systematic frontal and lateral tomograms of the cervicooccipital region. In 12 cases there were calcifications of the syndesmo-odontoid region. These calcifications are of two different types: linear calcifications (5 cases) and mottled calcifications (7 cases). The anatomic location of these calcifications is the transverse ligament or other structures of the syndesmo-odontoid joint. Although this type of calcification has already been described in other rheumatic diseases, it must lead to search for CPPD in the usual locations.
The results of a CT-anatomical correlative study of the main ligaments of the cervico-occipital hinge are reported. CT criteria of normal ligamentous structure of this region are presented in axial, coronal and sagittal views with a special attention to the transverse ligament of the Atlas. Examples of pathological transverse ligaments are illustrated and emphasis is laid upon the better statement CT allows in such cases.
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