Superior mesenteric artery (SMA) syndrome is a rare acquired disorder in which acute
angulation of SMA causes compression of the third part of the duodenum between the SMA and
the aorta, leading to upper gastrointestinal obstruction. Loss of fatty tissue as a result of a
variety of debilitating conditions is believed to be the aetiologic factor causing the acute
angulation. SMA syndrome is an atypical cause of high intestinal obstruction, most frequently
occurring in patients who have had rapid weight loss. Identification of this syndrome can be a
diagnostic dilemma and is frequently made by exclusion. We report a case of 13 year female
who was initially diagnosed as anorexia nervosa due to her symptoms of vomiting and anorexia
without any clinical cause, but later on, she underwent barium meal follow through (BMFT)
and computed tomogram (CT) and diagnosed as superior mesenteric artery syndrome (SMAS).
Duodenojejunostomy was done as an operative treatment. Post operative three months follow
up was uneventful