1 | partial | rt, hypoplasia | | both sides: extraspinal canal |

2 | complete | rt, hypoplasia | | both sides: extraspinal canal |

3 | partial | no laterality | | both sides: normal |

4 | complete | rt, agenesis | rt | lt: intraspinal canal under the atlas |

5 | complete | lt, agenesis | lt | rt: extraspinal canal |

6 | complete | rt, hypoplasia | | both sides: extraspinal canal |

7 | partial | lt, agenesis | lt | rt: normal |

8 | complete | no laterality | | rt: extraspinal canal lt: intraspinal canal under the atlas |

9 | complete | rt, hypoplasia | | both sides: extraspinal canal |

10 | partial | rt, agenesis | rt | lt: normal |

11 | complete | rt, hypoplasia | | both sides: extraspinal canal |

12 | complete | rt, hypoplasia | rt | both sides: extraspinal canal |