SGCE and Myoclonus: Family K5 was given a syndromic diagnosis of myoclonus‐dystonia, but tested negative for mutations the epsilon sarcoglycan gene (SGCE).33 On review of the phenomenology (see Video 3, Segment 2), although some of the involuntary movements could be labeled as chorea, there are also other movements that are shock‐like, occurring in the distal and proximal upper limbs, face, and trunk.