Chiari malformation type I

Arnold-Chiari malformation type I is a central nervous system malformation characterized by caudal displacement of the cerebellar tonsils exceeding 5mm below the foramen magnum with or without syringomyelia. Symptoms vary in onset and severity and include suboccipital headache, neck pain, vertigo, tinnitus, ocular symptoms (diplopia, blurred vision, photofobia, nystagmus), lower cranial nerve signs, cerebellar ataxia, and spasticity. Some affected individuals can be asymptomatic.

What is Chiari malformation type I?

Chiari malformation type I is a medical condition. A condition is a disease, disorder, or abnormal state that affects the body or mind. This page provides educational information only and is not a diagnosis.

If you think you may have Chiari malformation type I, speak with a qualified healthcare provider for evaluation and guidance.

Symptoms that may be associated with Chiari malformation type I

DiplopiaDysphagiaHeadacheHearing impairmentLimb muscle weaknessNeck painParesthesiaTinnitusUrinary incontinenceVertigo

When to seek medical care

Seek medical advice if you have symptoms that are severe, persistent, or affecting your daily life. Emergency care is needed for symptoms like chest pain, difficulty breathing, confusion, or severe weakness.