Introduction: This report describes a "parasitic" endometriotic cyst of the small bowel.
Clinical picture: A menopausal woman with a pelvic mass presenting years after commencing hormone therapy.
Treatment: We performed laparoscopic excision of a cystic tumour attached to the small bowel with a solitary vascular pedicle.
Outcome: Histology confirmed it to be an endometriotic cyst of ovarian origin, probably resulting from spillage during previous surgery and reactivation with hormone therapy.
Conclusions: We discuss the possible aetiology of this unusual presentation of endometriosis and review the literature on parasitic gynaecological tumours.