Citation, DOI, disclosures and article data
Citation:
Hacking C, Deng F, Fortin F, et al. Basion-dens interval. Reference article, Radiopaedia.org (Accessed on 19 Feb 2025) https://doi.org/10.53347/rID-40481
The basion-dens interval (BDI) is the distance between the basion and the tip of the dens, used in the diagnosis of atlanto-occipital dissociation injuries.
It is the distance from the most inferior portion of the basion to the closest point of the superior aspect of the dens in the median (midsagittal) plane.
Normal values for adults are <12 mm on plain radiographs and <8.5 mm on CT 1. In children, >10 mm suggests atlanto-occipital dissociation 2.
See also
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1. Rojas C, Bertozzi J, Martinez C, Whitlow J. Reassessment of the Craniocervical Junction: Normal Values on CT. AJNR Am J Neuroradiol. 2007;28(9):1819-23. doi:10.3174/ajnr.A0660 - Pubmed
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2. Riascos R, Bonfante E, Cotes C, Guirguis M, Hakimelahi R, West C. Imaging of Atlanto-Occipital and Atlantoaxial Traumatic Injuries: What the Radiologist Needs to Know. Radiographics. 2015;35(7):2121-34. doi:10.1148/rg.2015150035 - Pubmed
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