Abstract:
Background. Myoclonus-dystonia is a movement disorder that typically affects the neck, torso,
and arms. Individuals with this condition experience quick, involuntary muscle jerks or twitches
(myoclonus). About half of individuals with myoclonus-dystonia develop dystonia, which is
involuntary tensing of various muscles that causes unusual positioning. In myoclonus-dystonia,
dystonia often affects one or both hands, causing writer's cramp, or the neck, causing the head to
turn (torticollis).