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Additional file 1 Consent was obtained from the patients to be videoed for publication and academic purposes. Segment 1: Case I note the high frequency semirhythmic undulating movements directing upwards prior to Botulinum Toxin A (BTX) injections. Three weeks after BTX injections note the marked reduction of the amplitude and frequency of the dyskinetic movements. Segment 2: Case II showing the severe wavy dyskinetic movements in the sitting positions. The movements abolished when lying to the side and significantly decreased when supine. Eight weeks after BTX injections depicting the complete abolishment of the dyskinetic movements. (MP4 69525 kb)