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There is fusion of normal heighted C4-C5 vertebral bodies with loss of inter vertebral disc space; posterior elements are not fused.
2 case question available
Block vertebra is congenital verterbral anamoly in which there is fusion of two or more vertebral bodies secondary to failure of their separation.
- Dähnert W. Radiology Review Manual. Lippincott Williams & Wilkins. (2011) ISBN:1609139437.
- Moon MS, Yoon MG, Kwon KT, Kim SS, Lin JF, Lee BJ. Radiological Assessment of the Effect of Congenital C3-4 Synostosis on Adjacent Segments. Asian spine journal. 2015 Dec 1;9(6):895-900.