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Additional file 2: Video segment 2. This video demonstrates the clinical course of dystonic storm. The first segment shows the prodromal phase of dystonic storm (Fig. 1) in a young boy with DYT1 generalized dystonia. During this phase, dystonia severity was worse from his baseline. The latter part of the video demonstrates a patient in true dystonic storm phase (the trough portion of the graph in Fig. 1). He had severe dystonic posturing of bilateral arms and legs, seen as flexion of shoulders, elbows, hips and knees, giving a “pretzel-like” feature. (MP4 61017 kb)