Objective: Our aim is to report atypical types of psychogenic movement disorder presenting jaw-opening dystonia.

Background: Jaw-opening dystonia is a rare condition, and only a limited number of cases have been reported in the literature. Dystonia is rarely psychogenic and jaw-opening dystonia is extremely rare.

Methods: Two cases reports and description of clinical characteristics.

Results: We report two patients with clinically established psychogenic dystonia. Patient 1 is a female that presented sudden-onset, involuntary opening of mouth one day ago. She developed clinically non-fixed, continual jaw-opening dystonia and hypertonia of jaw and mouth disappeared with distraction. Psychological examination showed severe stressful condition and depression. Patient 2 is a female that presented with involuntary opening of mouth and irregular limb tremors at post-natal state after delivery. She also developed clinically similar type of jaw-opening dystonia, which disappeared with distraction. Psychological examination showed postpartum depression.

Conclusions: To our knowledge, this is the first case report of psychogenic jaw opening dystonia. As like these cases, if there is abrupt-onset, not-fixed, continual jaw-opening dystonia with clinically inconsistent and incongruous characteristics, it should be considered diagnosis of psychogenic jaw-opening dystonia.

XXI World Congress on Parkinson’s disease and Related Disorders (IAPRD 6-9 December, 2015, Milan, Italy).

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MDS Abstracts - https://www.mdsabstracts.org/abstract/atypical-presentation-of-psychogenic-movement-disorder-with-jaw-opening-dystonia-two-cases-reports/