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Additional file 5: Video segment 5. This video segment demonstrates pure choreic storm (Patients 1–3). Patient 1 had non-ketotic hyperglycemia. He presented with prominent chorea in the orobuccolingual region and bilateral arms. Patient 2 also had non-ketotic hyperglycemia. Nevertheless, chorea in this patient mainly affected the left arm and leg, and to a lesser extent, the right leg without orobuccolingual chorea. Patient 3 is a young boy with Sydenham’s chorea. He had history of streptococcal pharyngitis a few months prior. Prominent chorea involved bilateral arms, trunk and, to a lesser extent, perioral region. (MP4 64087 kb)