Incidence and Management of Basilar Invagination With Associated Chiari I Malformation

In patients with BI, concomitant CMI is a modifier of surgical management. In BI with AAD, an additional foramen magnum decompression should be added to posterior C1-C2 realignment and fusion. In BI without AAD, whether treatment is restricted to FMD or C1/2 fusion is required on top or alternatively, demands further studies. Odontoid resections are reserved for patients with insufficient alignment after posterior surgery.