Spontaneous ectopic pregnancy occurring in the distal fallopian tube cut off from the uterus after an incomplete prior operation to remove only the middle of the fallopian tube: A case report.

After salpingectomy, recurrent ectopic pregnancies occur in the contralateral fallopian tube. Here, we present a case of ipsilateral remnant fallopian tube pregnancy in a 30-year-old woman with a history of incomplete prior operation to remove the middle region of the left fallopian tube following fallopian tube isthmus pregnancy 6 years earlier. During the previous salpingectomy, the left fallopian tube was not completely observed because of adhesions to the pelvic peritoneum and sigmoid colon; a partial remnant may have been present. The patient presented with lower abdominal pain 6 weeks after the most recent menstrual cycle, and transvaginal ultrasonography revealed a remnant left fallopian tube ectopic pregnancy. A 4 cm-sized mass identified at the distal end of the remnant left fallopian tube and the proximal remnant tube were laparoscopically removed. The possibility of an ipsilateral remnant tubal pregnancy should be carefully considered in spontaneous pregnancy after partial fallopian tube resection.