We presented a 47 year old lady in whom, during the investigation for unstable arterial hypertension and lumbar pain, ultrasonography and computed tomography showed a polycystic mass retroperitoneally in the level of the pancreas. During operation a chylous lymphangioma of the pancreas was found and was almost entirely excised. The remaining mass was opened and left to drain into abdominal cavity. The recovery was uneventful. Hystology confirmed chylous limphangioma. The patient stayed symptom-free with normal clinical, ultrasonographic and laboratory data for more than a year after surgery. Lumbar pain disappeared and blood pressure became normal.