Case 3. Case 3. Diskovertebral erosion, pseudarthrosis, with posterior column involvement.A, Conventional radiograph of the thoracic spine, showing squaring.

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Presentation transcript:

Case 3. Case 3. Diskovertebral erosion, pseudarthrosis, with posterior column involvement.A, Conventional radiograph of the thoracic spine, showing squaring of the vertebral bodies and ossification of the ALL due to AS. Increased disk space of T10–T11 (arrow), endplate erosion, and hyperostotic change in the bone marrow of the adjacent vertebral bodies (arrowheads) were compatible with pseudarthrosis. The hyperostotic change is consistent with a long-term chronic lesion. The facet lesion is not shown well in the conventional radiographs because of overlapping by adjacent structures.B, Anterior 3D surface-rendered CT reconstruction shows a gap in the ALL and disk space at T10–T11 level (arrows) and another gap in the ALL at the level of the T11–T12 disk (arrowhead), which indicates tearing of the ALL and erosion of the vertebral body at the insertion of this ligament.C, Sagittal, thin-section, reformatted CT scan image. In addition to the above-mentioned lesions, this reformatted image shows the fracture in the facet (arrow). The diskovertebral lesion is shown better in this image than in conventional radiographs.D, Conventional radiograph 30 months earlier than A–C, showing squaring of the vertebral bodies and diskovertebral lesion with less extensive sclerotic change (white arrow) than A. Yi-Fen Wang et al. AJNR Am J Neuroradiol 2005;26:2067-2076 ©2005 by American Society of Neuroradiology