Pseudospread of the atlas
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Pseudospread of the Atlas 1
- Defined: > 2 mm total overlap of the two C1 lateral masses on C2 on AP open- mouth view.
- Prevalence: 91-100% during second year of life
- Youngest: 3 months
- Oldest: 4 years
- 2mm during first year.
- 4mm during the second.
- 6mm during the third.
- Decreases after that.
- Max is 8m
- Trauma is not a contributing factor
- Neck rotation can stimulate the appearance of a Jefferson fracture.
- Probably a result of disproportionate grown of the atlas on the axis. 'Misdiagnosed as JEFFERSON FRACTURE.'
- Rarely occurs prior to teen years.
- If suspicion for fracture is high: CT scan through C1 can resolve the issue.
1. Suss RA, Zimmerman RD, Leeds NE. Pseudospread of the atlas: False sign of jefferson fracture in young children. AJR Am J Roentgenol. 1983;140:1079-1082