Introduction: Retroperitoneal cystic lymphangioma is a rare benign tumor of the retroperitoneal lymphatics that usually manifests in infancy. It is worth to Report of unexpected presentation especially in Adult. Case Presentation: An adult patient with Left Lower abdominal was referred to our hospital. Abdominal ultra-sonography revealed a large, multilocular, cystic mass with an obscure margin. CT of the abdomen showed a large homogeneous mass. Laparoscopy revealed a huge retroperitoneal cystic lymphangioma confirmed by histopathology. Conclusion: Adult cyst lymphangioma is the rare benign tumor with unclear intra abdominal manifestation. In our report the retroperitoneum was the rare location of this tumor.
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