A Case of Benign Mature Cystic Teratoma of Left Fallopian Tube Along with Right Endometrial Ovarian Cyst

ObjectiveTo report a case of benign mature cystic teratoma of fallopian tube along with endometrial ovarian cyst, occasionally found during the operation.MethodsA 30-year-old patient complained of mild dysmenorrhea and gradual enlargement of bilateral adnexal cysts in the past one year. At the age of 27 she had undergone a laparoscopic right ovarian endometrial cyst ablation. Before the second operation, pelvic ultrasound revealed recurrence of bilateral cysts in the adnexal regions, as well as serum concentrations of CA19-9 and CA125 above normal limits. Laparotomy revealed a 7 cm cystic mass of the right ovary, tightly adhesive to the lateral pelvic; a 10 cm-large mass on the left adnexal region embedded among intestines. The left adnexal mass appeared to be attached to the fimbriated end of the left fallopian tube with the ipsi-lateral ovary. However the left fallopian tube was obscure because of severe synechia. After separating the adhesion, we found the left hydrosalpinx.ResultsDuring laparotomy, both the cyst on the right ovary and the left fallopian tube were removed. Grossly, it revealed enlargement of the left fallopian tube in diameter 1.3 cm, with 2 neoplasms, in diameter 0.6 cm and off-white and smooth appearance. This mass was considered to be a mature solid teratoma arising in the left fallopian tube. At the same time it indicated left hydrosalpinx.ConclusionAlthough mature cystic teratomas are derived from ovarian germ cells (in proportion of 16%-20%), mature teratoma of the fallopian tube is very rare. Once diagnosis, the operation will be recommended. This case was revealed during the laparotomy accidentally. The prognosis was good.