The occurrence of accessory pancreatic tissue in man is rather uncommon; a careful review of the literature by Warthin1 in 1904 revealed only forty-seven cases, to which he added two. One case was reported in 1894 by Biggs, 2 which was not included in Warthin's survey, since which thirty-one additional cases have been reported (Table 1). Twelve of these thirty-two cases were found at operation, the remainder at necropsy.
In a series of 321 consecutive necropsies in the Mayo Clinic in which the entire length of the intestine was opened in 314 cases, I found accessory pancreases in two cases (0.6 per cent.). In one case the aberrant tissue was in the stomach; in the other, in the duodenum. These statistics conform to Opie's,3 who found ten cases of aberrant pancreatic tissue in 1,800 necropsies. In several instances, I have observed accessory pancreatic tissue in the jejunum at