5 Facts you should know about

Arnold–Chiari malformation

Arnold–Chiari malformation is a malformation of the skull

It is usually caused by structural defects in the brain and spinal cord that occur during fetal development

It consists of a downward displacement of the cerebellar tonsils through the foramen magnum

The cerebrospinal fluid outflow is caused by phase difference in outflow and influx of blood in the vasculature of the brain

Headache is the hallmark sign of Chiari malformation, especially after sudden coughing, sneezing, or straining

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