憩室(diverticulum)是消化道的局部囊样膨出,分真性(全层膨出)和假性(仅黏膜和黏膜下层膨出)憩室两种。憩室绝大多数向消化道外膨出,极少数向消化道内膨出,后者称腔内憩室。多个憩室同时并存者称为憩室病(diverticulosis)。十二指肠憩室是最常见的小肠憩室,好发于十二指肠降部内侧胆总管开口处2.5cm范围内,故称十二指肠乳头旁憩室(JDD。Juxtapapillary duodenal diverticulum)或胆道口(Vater)壶腹周围憩室(perivaterian divertic ......