Chiari II malformation involves elongation of the brainstem and cerebellum through which opening?

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Multiple Choice

Chiari II malformation involves elongation of the brainstem and cerebellum through which opening?

Explanation:
Chiari II malformation is marked by downward displacement of the brainstem and cerebellum through the opening at the base of the skull where the brain becomes the spinal cord. This opening is the foramen magnum, the largest skull base opening through which the brainstem and upper spinal cord pass. The downward herniation through this canal is characteristic of Chiari II and is often associated with spinal neural tube defects like myelomeningocele. The other openings listed are not involved in this process: they are separate skull base foramina that transmit different nerves or vessels and do not serve as the site of hindbrain herniation seen in Chiari II.

Chiari II malformation is marked by downward displacement of the brainstem and cerebellum through the opening at the base of the skull where the brain becomes the spinal cord. This opening is the foramen magnum, the largest skull base opening through which the brainstem and upper spinal cord pass. The downward herniation through this canal is characteristic of Chiari II and is often associated with spinal neural tube defects like myelomeningocele. The other openings listed are not involved in this process: they are separate skull base foramina that transmit different nerves or vessels and do not serve as the site of hindbrain herniation seen in Chiari II.

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