Tailgut cysts and rectal gastrointestinal stromal tumors (GIST) are rare found in the retrorectal space. congenital malformations resulting from incomplete regression of hindgut during embryogenesis they mostly affect women third to sixth decade life; GIST account for 5% all GIST. Both conditions may present with nonspecific symptoms such as pelvic or anal pain, bleeding weight loss. usually be...