Two adolescent girls with evidence of extrinsic duodenal obstruction caused by superior mesenteric artery are presented. Both cases shared in common low food ingestion of psycological origin, but their initial complaints were different: the first patient was refered because of intermitent abdominal pain and vomit us, the second one was admited for acute high intestinal oclussion. Both girls envolved favourably under therapy with small frecuent meals and postural treatment. (Key words: Duodenal obstruction. Superior mesenteric artery).