Successful management of a rudimentary uterine horn ectopic pregnancy by combining methotrexate and surgery: A case report

•The prevalence of rudimentary uterine horn ectopic pregnancy is very low (1 in 76 000–150 000 pregnancies).•Early diagnosis of a rudimentary horn pregnancy is the key to successful management.•The medical treatment may be a successful adjuvant therapy to surgical removal in asymptomatic women.