Episodic ataxia type 3 (EA3) is a very rare form of Hereditary episodic ataxia characterized by vestibular ataxia, vertigo, tinnitus, and interictal myokymia. The disease is episodic ataxia type 3 (Monarch Disease Ontology identifier MONDO_0011682). Also known as: episodic ataxia-vertigo-tinnitus-myokymia syndrome.