Schistosoma mansoni: an unusual cause of ovarian pseudotumor

Schistosomiasis is a disease prevalent throughout the world, but the involvement of ovary by Schistosoma mansoni eggs is rarely found. The pathological mechanisms involved in the infestation of the ovary remain unknown and the diagnosis usually occurs, retrospectively, by histopathological examination. An uncommon case of ovarian pseudotumor due to Manson's schistosomiasis is reported.

A 40-year-old woman referred with recurrent poorly characterized pelvic pain underwent surgical exploration and right salpingo-oophorectomy to treat a mixed cystic and solid ovarian tumor demonstrated preoperatively by transvaginal ultrasound of pelvis. The pathological examination of surgical product revealed a pseudotumor due to granulomatous reaction triggered by eggs of S. mansoni. The patient was referred to clinical treatment with oxamniquine and remained asymptomatic for a year follow-up.

Ovarian ectopic S. mansoni is rarely reported in the most current literature; however, this actual proportion of ovarian Manson's schistosomiasis may not represent the real female genital involvement rates and reflect an underestimation of internal genital disease.