[Multiloculated mesenteric and retroperitoneal tumour - lymphatic malformation - in a 4-year-old girl].

Mesenteric cysts are rare and mostly benign abdominal tumours in children. Majority of them are lymphangiomas (lymphatic malformations). We diagnosed a broad, multiloculated mesenteric and retroperitoneal cyst, associated with intensive inflammation, in a 4-year-old girl. Surgical therapy was fully successful.