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Episodic ataxia type 2 is an autosomal dominant channelopathy, caused by genetic variants in the voltage-dependent calcium channel a-1 subunit (CACNA1A), which is characterized by intermittent episodes of vertigo and ataxia. A slow progression of cerebellar signs is commonly observed in the course of the disease. Treatment with the carbonic anhydrase inhibitor acetazolamide is recommended.