Figure 1.

Photographs show (A) action-induced opisthotonus that occurs when sitting up from bed (Patient 1, PANK2 mutations); (B) spontaneous, painful retrocollis and dystonic opisthotonus (Patient 2, PANK2 mutations); (C) dystonic opisthotonus while walking (Patient 3, PLA2G6 mutations); and (D) retrocollis (Patient 4, PLA2G6 mutations).