Atlantosulcus ring malformation
Groove ring malformations are not uncommon on the atlas, accounting for 2% to 3% of normal people. However, due to this deformity, the third segment (V-Ⅲ) of the vertebral artery is compressed and the symptoms of vertebral artery insufficiency are rare, which is less than 1/10 of those with this deformity.
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