Chiari II malformation
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 Discussion of Chiari II malformation
 Imaging Findings for Chiari II malformation
- Small posterior fossa
- Large foramen magnum: The posterior fossa is exceptionally small, and the foramen magnum is larger and rounder than usual.
- Low lying cerebellar tonsils
- Medullary kink
- Towering cerebellum: Cerebellum extends above the incisura of the tentorium.
- Elongated fourth ventricle
- Beaked tectum
- Hydrocephalus: present in up to 98% of patients
- Prominent massa intermedia
- Lacunar skull or lückenschädel: Dysplasia of the membranous bones of the calvarium that disappears after approximately 6 months of age. (written boards question)