An unusual case of action-induced jerking
The present case has been reported in the journal Neurology.

A right-handed 62-year-old man developed a persistent involuntary jerky movement of the right arm when initiating movements like getting up from a chair or opening the door, persisting while the task is performed (video available).

CT head scan was normal. Elsewhere, a functional movement disorder was diagnosed. An MRI head revealed an old hemorrhage in the left supplementary motor area (SMA), an area involved in movement initiation and sequencing complex movements.

EEG and Bereitschaftspotential were normal. A year later, he developed generalized nocturnal seizures. Misdiagnosis of an SMA stroke as a functional movement disorder has previously been reported.