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Cavernous lymphangioma (cystic hygroma) is a rare form of mesenteric cystic tumor, which can be located anywhere along the intestinal mesenterium or elsewhere in the body. Mesenteric cystic tumors are rare malformations. They are more common in pediatric population with estimated incidence to be 1 in 20.000 patients, rarely they occur in adults with estimated incidence to be 1 in 100.000 patients. Usually they are benign growths with malignant transformation reported in 3% of cases and they usually present in the first decade of life. Mesenteric cysts are often incidental findings on physical examination or imaging in about 40% of cases, but they can cause unspecific abdomainal symptoms. In this article is presented a case of a 26-year-old male patient with a large cystic mesenteric tumor, a cavernous lymphangioma.