Chiari malformation type II
Findings
No curated finding names Chiari malformation type II yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Arnold-Chiari malformation type II is a rare, central nervous system malformation characterized by caudal displacement of the cerebellum, pons, medulla and fourth ventricle through the foramen magnum into the spinal canal, and is typically associated with myelomeningocele. Variable other central nervous system abnormalities might be present (partial or complete agenesis of the corpus callosum, a small fourth ventricle, obstructive hydrocephalus, falx and tentorium defects, and polygyria). Symptoms include hypotonia, apnea with cyanosis, dysphagia, opisthotonus, nystagmus, spasticity, ataxia, and occipital headache.
Definition from the Mondo Disease Ontology (MONDO:0008816), read 2026-09-29. CC BY 4.0.
Where it sits
Other names
3 names
Resolves to: Chiari malformation type II
- Also called
- Arnold-Chiari malformation type 2Arnold-Chiari malformation type IIChiari malformation type 2