A practical approach to the diagnosis of autoimmune pancreatitis

Table 1 Frequency of benign lesions in patients who undergo pancreatico-duodenectomy in the presence of a pancreatic mass suspected of being pancreatic adenocarcinoma

Authors	Yr	No. of pts	Frequency of benign lesions
			n	%
Smith et al[13]	1994	603	29	5
Barens et al[14]	1996	510	108	21
van Gulik et al[15]	1997	220	14	6
Abraham et al[16]	2003	442	47	10.4
Weber et al[17]	2003	1287	159	12
Kennedy et al[18]	2006	162	21	12.9
De La Fuente et al[19]	2010	494	37	7.4
Hurtuk et al[20]	2010	461	35	8
All studies	-	4179	450	10.8