Familial hemiplegic migraine (FHM) can be loosely divided into two categories: with and without cerebellar signs. Cerebellar signs refer to ataxia, sometimes episodic and other times progressive, that can accompany FHM1 mutations and is caused by degeneration of the cerebellum.
Familial hemiplegic migraine (FHM) is divided into two groups: those with and without cerebellar symptoms. Cerebellar signs include ataxia, which can be intermittent or worsening over time, and are linked to FHM1 mutations. This ataxia arises from damage to the cerebellum.