Crossed renal ectopia with rectal cancer: a Case ReportZhenwei Tang 1 Huifeng Yang 2 Zhaoyu Wu 3 Changyou Wang4*1.North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail: 2756084798@qq.com2. North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail：2453524391@qq.com3 North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail：wuzhaoyu1111100@163.com4 *Corresponding author:North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail: fhbj-2004@163.com