superior duodenal fossa

su·pe·ri·or du·o·de·nal fos·sa

[TA] a peritoneal recess extending upward behind the superior duodenal fold. Synonym(s): recessus duodenalis superior [TA], superior duodenal recess ☆ , duodenojejunal fossa, duodenojejunal recess, Jonnesco fossa