１　病例介绍　　患者，男，１８岁。发现左下腹无痛性包块７个月，近期内生长较快。于１９９８年１０月２８日入院。查体：左下腹部膨隆，局部触及１７ｃｍ×１０ｃｍ大小包块，无压痛、活动度小。１９９８年１０月３１日行剖腹探查，肿瘤切除术。术中见肿瘤位于左下腹腔内， 1 Case Introduction Patients, male, 18 years old. Painless masses in the left lower abdomen were found for 7 months and were rapidly growing in the near future. He was admitted to hospital on October 28, 1998. Physical examination: left lower abdomen bulging, localized mass of 17cm x 10cm mass, no tenderness, little activity. On October 31, 1998, laparotomy and tumor resection were performed. During surgery, the tumor was located in the left lower abdominal cavity.