患者女 ,2 6岁 ,因发现腹部肿块 4ｄ入院。Ｂ超检查示右中上腹部探及一较大肿块 ,114ｍｍ× 92ｍｍ× 79ｍｍ ,轮廓清 ,有包膜。左边界邻近胰头 ,胰头轮廓欠清 ,体尾部正常。ＣＴ检查示腹膜后巨大占位性病变 ,身体其它部位未见肿物。实验室检查无特殊。术中见升结肠系膜后 ,右 Female patient, 26 years old, because of abdominal mass found 4d admission. B-ultrasound showed the right middle and upper abdomen exploration and a larger mass, 114mm × 92mm × 79mm, clear outline, a capsule. Adjacent to the left border of the head of pancreas, pancreatic head contour is not clear, body tail normal. CT examination showed a huge retroperitoneal space-occupying lesions, no other body mass. No special laboratory test. Surgery see ascending mesenteric, right