Chiari I malformation is when the lower part of the cerebellum extends into the foramen magnum. Type I may not cause any symptoms. In fact, it may not detected until much later in life.
Chiari II malformation (Arnold-Chiari malformation) is the herniation of the cerebellar vermis and brain stem through the foramen magnum. The herniation can then cause hydrocephalus. Type II is associated with myelomeningocele. During antenatal care, an ultrasound may show a lemon or banana sign. Infants may display symptoms such as stridor (sounds like a seal), dysphagia, hypotonia, and ataxia.
https://rarediseases.info.nih.gov/diseases/9232/chiari-malformation-type-2
https://radiopaedia.org/articles/chiari-ii-malformation
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