López-GarcíaL.J., OjedaA., ToroD.H.Primary duodenal signet-ring cell carcinoma presenting as gastric outlet obstruction.P R Health Sci J2006; 25: 355–7.
2.
Sierra AusinM., Linares TorresP., Alvares PosadillaM.Signet-ring cell adenocarcinoma of the duodenal bulb.Gastroenterol Hepatol2008; 31: 107–8.
3.
TokuhiroN., HiraiY., SuzukiR.A case of primary signet-ring cell carcinoma in the 3rd part of the duodenum.Nippon Shokakibyo Gakkai Zasshi1995; 92: 874–8.
4.
YoonY.S., KimS.W., ParkS.J.Clinicopathologic analysis of early ampullary cancers with a focus on the feasibility of ampullectomy.Ann Surg2005; 242: 92–100.