Block vertebra C3/4
Cervical spine radiograph
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Fusion of the anterior and posterior elements of C3/4 vertebrae with loss of intervening disc space. Loss of cervical lordosis.
Block vertebra is a congenital failure of segmentation of somites. May be partial or complete involving anterior and/or posterior elements. May demonstrate a decreased anteroposterior vertebral body diameter. Usually asymptomatic. Secondary to the fusion, these vertebrae are not amenable to degenerative changes, however the additional stress is transferred on to the distal joint. They may be accompanied by neural foraminal narrowing or enlargement.
- Kumar, Rajendra, et al. "The vertebral body: radiographic configurations in various congenital and acquired disorders." Radiographics 8.3 (1988): 455-485.Pubmed citation