Fig. 1From: Rosai–Dorfman disease mimicking IgG4-related diseases: a single-center experience in ChinaSerum IgG4 of patients with RDD mimic IgG4-RD and IgG4-RD. a Serum IgG4 levels in RDD mimic IgG4-RD patients and IgG4-RD patients. b Percentages of different ratios of serum IgG4 to IgG1 in RDD mimic IgG4-RD patients and IgG4-RD patients. Grey: percentages of patients with a ratio of serum IgG4 to IgG1 no more than 1. White: percentages of patients with a ratio of serum IgG4 to IgG1 more than 1.Back to article page