Types
- Dystonia disorders are classified according to the distribution of symptoms in the body
Focal dystonia
- Involving only one body region. The majority of cases are idiopathic and onset is typically in adulthood (usually > 30 years). Patients may have sensory tricks with which they are able to suppress spasms (e.g. touching the affected region)
Conditions
- Spasmodic torticollis: cervical dystonia , abnormal head movements or fixed head posture
- Blepharospasm: Eye dystonia , increased blinking or involuntary eye closure
- Spasmodic dysphonia: laryngeal dystonia or voice dystonia, Voice breaks or strained voice
- Oromandibular dystonia: involuntary movements of the tongue, jaw, and/or face
- writer's cramp : non-painful contractions of hand muscles that are provoked by specific tasks (e.g. writing)
Segmental dystonia
- Involvement of two or more contiguous regions. For e.g. blepharospasm with oromandibular dystonia , cervical dystonia with upper limb dystonia
Multifocal
- Two or more non contiguous regions, e.g Blepharospasm with upper limb dystonia
Hemi dystonia
- Dystonia involving one half of the body
Generalized dystonia : Affects the trunk and at least two additional regions of the body
- Typically early onset (< 21 years of age)
Conditions
- Dopa-responsive dystonia (Segawa syndrome): rare, genetic disorder with onset in childhood
- Neuroleptic induced acute dystonia
- Torsion dystonia (dystonia musculorum deformans) – is rare, idiopathic disorder with onset in childhood