Digastric line

The digastric (or biventer) line has been described and used to evaluate basilar invagination on frontal skull plain film and coronal recontructed CT image. 

The digastric line is drawn between right and left digastric grooves. The tip of the odontoid process and atlanto-occipital joint normally project 11 mm and 12 mm below this line respectively. Basilar invagination is present when atlanto-occipital joint projects at or above this line.

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Article information

rID: 27186
System: Head & Neck
Section: Approach
Tag: pm
Synonyms or Alternate Spellings:
  • Biventer line

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Cases and figures

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    Figure 1: Digastic line
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    Figure 2
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