Failure of C1 anterior and posterior arch fusion, anatomic variant. No acute fracture or malalignment.
Congenital anomalies of C1 are relatively common and almost always benign and incidental. Failure of posterior arch fusion/ossification is most common and occurs in approximately 4% of the population.
These anomalies can be classified according to a system created by Currarino. While it’s not necessary to memorize this scheme, it’s worth being familiar with to avoid misdiagnosing a benign process as something pathologic.
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