Figure 2 Clinical course of Visual Analogue Scale (VAS) and manual muscle test in the left thigh. A 10 cm VAS was anchored by two extremes of pain (left, no pain; right, the worst pain imaginable), and pain ratings were assigned subjectively according to the manner described by Kelly.8 Results of the manual muscle test in the left quadriceps femoris muscle are shown in six stages from 0 to 5. Horizontal bars indicate days during which the given drugs were administered. IVIg, intravenous immunoglobulin therapy; PSL, prednisolone.