INTRODUCTIONThis report describes a "parasitic" endometriotic cyst of the small bowel.

CLINICAL PICTUREA menopausal woman with a pelvic mass presenting years after commencing hormone therapy.

TREATMENTWe performed laparoscopic excision of a cystic tumour attached to the small bowel with a solitary vascular pedicle.

OUTCOMEHistology confirmed it to be an endometriotic cyst of ovarian origin, probably resulting from spillage during previous surgery and reactivation with hormone therapy.

CONCLUSIONSWe discuss the possible aetiology of this unusual presentation of endometriosis and review the literature on parasitic gynaecological tumours.

Cysts ; pathology ; Endometriosis ; diagnosis ; etiology ; Estrogen Replacement Therapy ; Female ; Genital Diseases, Female ; Humans ; Intestine, Small ; physiopathology ; Middle Aged