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Clinical course. The y-axis on the left side shows the PR3-ANCA titer. The y-axis on the right side indicates the level of serum CK. CK was elevated on day 5 and peaked on day 11. The progression of muscle weakness and CK increase were highly correlated. The PR3-ANCA titer also decreased after treatment. After mPSL pulse therapy, CK gradually decreased to normal, and the muscle strength returned.
