Table 2. Comparison of clinical and serological features between single and multiple lesions.

Parameters	Single lesion	Double lesions	Triple lesions	Four or more lesions
No.	67	36	19	10
Male:Female	46:21	22:14	11:8	8:2
IgG4 (mg/dL)	307.4	655.2*	930.9*	976.6*
IgG (mg/dL)	2,003.6	2,190.9	2,432.8	2,644.2

^*P<0.001 compared to single lesion. Serum IgG4 levels were significantly higher in patients with multiple lesions (783.2 mg/dL) than in those with a single lesion (P<0.01).