Superior mesenteric artery syndrome presenting as an anorexia nervosa-like illness

Anorexia nervosa is often overdiagnosed in adolescent females with anorexia and extreme weight loss. In some cases, an anorexia nervosa-like illness is due to a treatable organic disorder. We describe a 16-year-old female with anorexia, vomiting, extreme weight loss, and amenorrhea who was referred as an anorexia nervosa case and was subsequently found to have superior mesenteric artery syndrome that was causing a duodenal obstruction. Conservative treatment with oral hypercaloric liquid feeding resulted in optimal weight gain and complete recovery. This syndrome should be considered in adolescents with an anorexia nervosa-like illness associated with vomiting and postprandial epigastric discomfort.