Introduction: Mesenteric cysts are rare intra abdominal masses and its prevalence is 1 out of 140000 in general hospitals and 1 out of 20000 in pediatric hospitals. In majority of the cases it is benign with several manifestations. Diagnosis is difficult , but with suspicion to cyst and using paraclinical procedures can be led to definite diagnosis. Case report: In this study a mesenteric cyst with unusual manifestation was studied. Our patient was a 50 - year old man with complaint of abdominal distention and dull pain in his abdomen. In abdominal examination, there was not any definite mass, but he had a generalized distention. At first we thought of bowel obstruction, but according to the radiologic findings, chess pattern of abdominal fluid in sonography, and CT-Scan pattern and with high suspicion to mesenteric cyst, the patient underwent operation and there was lots of cysts in his abdomen. Pathologic report was lymphatic cyst of mesentery. Patient left hospital with general good health and condition.

Keywords: Cyst, mesentery, Abdominal mass

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