Primary dystonia, DYT6 type

What it is

A rare genetic movement disorder characterized by dystonia affecting at first an upper limb, less frequently beginning in the head and neck region, before slowly spreading to other locations. The clinical spectrum, like age of onset, is variable with focal, segmental, or generalized distribution, but cranial involvement with speech difficulties and cervical involvement are typical, whereas lower limbs are often spared. With progression of the disease, many patients suffer from generalized dystonia while mostly remaining ambulatory.

Key facts

Prevalence

<1 / 1 000 000

Age of onset

Adolescent, Adult, Childhood

Inheritance

Autosomal dominant

Classified as

Disease

Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.

Signs and symptoms

These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.

Gene

ICD-10 codes

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references