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Mǔllerian cyst of the mesentery: A case report of an unusual location

Mǔllerian cysts or paramesonephric cysts arise from the fused embryonic ducts, which typically regress in the uterus. These cysts are usually located paravertebrally. We present an unusual case of a Mǔllerian cyst developing within the mesentery of the ileocecum that was successfully resected. The patient presented to our surgical unit with abdominal pain and swelling. She underwent all the necessary tests to rule out other pathologies before she underwent right hemicolectomy. The patient was discharged without complications. Histopathology confirmed the presence of female reproductive tract epithelium, which was conclusive of a Mǔllerian cyst or paramesonephric cyst. Mǔllerian cysts are rarely malignant, and they are usually treated surgically. The incidence of Mǔllerian cysts is one in 105,000, with almost equal sex distribution. Their unusual intraperitoneal location further demonstrates their uncommon presentation. Clin. Anat. 23:866–869, 2010. © 2010 Wiley‐Liss, Inc.