Table 1.

Relative numbers and proportions of benign and malignant diseases overall and per subgroup after definitive diagnosis was obtained (ie, after surgery or 24 months follow-up)

	Overall		Indeterminate biliary strictures		Primary sclerosing cholangitis
	N	%	N	%	N	%
Benign	43	70.5	32	66.7	11	84,6
Malignant	18	29.5	16	33.3	2	15,4
Total	61	100	48	100	13	100