Fresh upper gastrointestinal bleeding (hematemesis),a rare manifestation of retrograde intussusception following classic gastric bypass surgeryNader Moeinvaziri,*1 NaserAfshin1, Nazanin Setayeshpour1,Mohammad Ebrahimi1Laparoscopy research center, Shiraz University of Medical Sciences, Shiraz, Iran*Correspondence to: Nader MoeinvaziriAddress: Department of surgery, Shiraz University of Medical Sciences, Shiraz, IranEmail: nmv1986@yahoo.com Tel: +989177046901

Nader Moeinvaziri1, Alireza Sadeghi11 Minimally Invasive Surgery Research Center, Shiraz University of Medical Sciences, Shiraz, Iran

The retroperitoneal may be affected by variety of infectious, inflammations and tumors including benign or malignant ones. Although primary malignant tumors are the most prevalent tumors in this anatomic area, metastatic and invasive tumors rarely involve retroperitoneum. Gastrointestinal stromal tumors (GISTs) counted the most common tumors with invasion the retroperitoneum