1　病例简介　患者,男,15岁。因腹痛,皮肤、巩膜中度黄染1周入院。Ｘ线钡餐示:胃后壁受压,十二指肠球后部受推压,胃后脊柱椎体间隙明显增宽,诊断为腹膜后占位病变。Ｂ超示胰头部实质包块,境界不清。ＣＴ平扫示:胰腺后方巨大软组织肿块,约13ｃｍ×12ｃｍ×8ｃｍ;肿块密度均匀,界 1 Case Introduction The patient, male, is 15 years old. Due to abdominal pain, the skin and the sclera were yellowed for 1 week. X-ray barium meal showed that the posterior wall of the stomach was compressed, the back of the duodenal bulb was pushed, and the space between the posterior gastric vertebral body was significantly widened. The diagnosis was a retroperitoneal space-occupying lesion. B ultrasound showed pancreatic head parenchymal mass, unclear realm. CT plain scan showed a large soft tissue mass behind the pancreas, approximately 13cm x 12cm x 8cm; uniform mass density, border