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