Hydatid cyst is an infestation disease of the humans that caused by Echinococcus Granulosus and can involve all organs and tissues that produce cyst everywhere in body. The most common organ of body for development of a hydatid cyst is the liver (75%) and the lung (15%). We present a primary stomach hydatid cyst resected via laparotomy with the affected stomach wall. As far as we know, this is the first report of a primary stomach hydatid disease in the case presentation: A 64-year-old woman presented with a palpable mass on the epigastric and left upper quadrant of the abdomen. She had an 8-month history of intermittent abdominal pain attacks, discomfort, weight loss, anemia and early satiety. Abdominal examination revealed a palpable, immobile mass at the epigastrium and left hypochondriac region. Laboratory findings were unremarkable. Abdominal U&S and computed tomography (CT) scans revealed a heterogeneous mass originated from the stomach wall, spleen, pancreas or liver measuring 15x8cm. No pathological appearance was detected in the chest x-ray. Upper GI endoscopy was also unrevealing during diagnostic laparotomy. The pancreas, liver and spleen were intact, but we found a huge cystic mass located at the anterior surface of body of stomach. The mass was taken out from inside of the abdomen. Stomach defect closed the pathology report revealed a hydatid cyst.
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