Several reports have documented adenocarcinoma arising from endometriotic implants within cesarean section (C‐S) scars on the serosal surface of the uterus; however, endometrial cancer invading the C‐S scar from the uterine cavity has not been described. We report a case of a grade 1 endometrioid adenocarcinoma ‘drop’ lesion invading a previous C‐S scar with resultant cervical stromal invasion. Using both MR images and a thorough review of the pathology, the tumor at the C‐S scar was determined to be an implant derived from a primary lesion at the uterine fundus. With increases in the incidence of both endometrial cancer and births by C‐S, it is likely we will encounter more cases of iatrogenic implants of endometrial cancers in C‐S scars.