en Pediatrics Pediatrics case report case report <span style="font-size:14px;"><span style="font-family:Times New Roman;"><span style="line-height:14pt"><b><i><span style="color:blue">Background:</span></i></b> Abdominal distension in children can be caused by fluid accumulation due to ascites or large cysts.</span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Case Presentation:</span></i></b> A 25-month-old girl was brought to the pediatric gastroenterology clinic with the chief complaint of nontraumatic acute abdominal pain. She had undergone paracentesis last year with a diagnosis of suspected ascites in another medical clinic. Moreover, a CT scan following paracentesis was reported to be normal. After a few months, she gradually developed abdominal distension again. Diagnostic evaluations along with biochemical parameters and imaging strongly suggested the presence of a cyst. The large mesenteric cyst was totally removed by surgery.</span><br> <span style="line-height:14pt"><b><i><span style="color:blue">Conclusion:</span></i></b><b> </b>In conclusion, in the face of recurrence of abdominal fluid accumulation, mesenteric cysts should be considered despite the fact that abdominal CT scan is normal after paracentesis.<b><i><span style="color:#0033cc"></span></i></b></span></span></span><br> &nbsp; Ascites, Paracentesis , CT scan, Cystic lymphangiomas 581 585 http://caspjim.com/browse.php?a_code=A-10-2736-1&slc_lang=en&sid=1 Armineh Barzegar Arminhbarzegar97@gmail.com 100319475328460043098 100319475328460043098 No Non-Communicable Pediatric Diseases Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran Mohammadreza Esmaeili Dooki esmaeilidooki@yahoo.com 100319475328460043099 100319475328460043099 Yes Non-Communicable Pediatric Disease Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran Abbas Hadipour a_hadipoor@yahoo.com 100319475328460043100 100319475328460043100 No Non-Communicable Pediatric Disease Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran mohammad Pournasrollah pornasrollah@yahoo.com 100319475328460043101 100319475328460043101 No Clinical Research Development Center, Amirkola Children's Hospital, Babol University of Medical Sciences, Babol, Iran Hajighorban Noreddini Nooreddini@gmail.com 100319475328460043102 100319475328460043102 No Clinical Research Development Center, Amirkola Children's Hospital, Babol University of Medical Sciences, Babol, Iran