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: [email protected]. North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail：[email protected] North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail：[email protected] *Corresponding author:North China University of Science and Technology Affiliated Hospital,Tangshan 063000, Hebei Province,ChinaE-mail: [email protected]