Table 1.

Evolving classifications for the dystonias

Fahn and Eldridge (1976)	Fahn (1988)	Fahn (1998)	Bressman (2004)	Albanese (2011)
Primary	Idiopathic	Primary	Primary	Primary
Hereditary		Hereditary	Hereditary	Pure
Sporadic		Sporadic	Sporadic	Dystonia plus
				Paroxysmal
Secondary	Symptomatic	Dystonia Plus	Secondary	Heredodegenerative
Heredodegenerative			Dystonia plus
Environmental			Degenerative
			Complex
			Acquired
Psychological		Heredodegenerative		Secondary
		Acquired

This table shows a representative sample of some of the most commonly used classifications for dystonia.