Endometriosis of the retrocervical septum is proposed to replace the anatomically incorrect term endometriosis of the rectovaginal septum.

We propose that the term retrocervical septum be added to the medical lexicon to designate the anatomic location of endometriosis of the septum that separates the vagina and posterior vaginal fornix from the rectovaginal pouch of Douglas. Use of the terms retrocervical septum and endometriosis of the retrocervical septum would correct the century-long misuse of the anatomically incorrect term, endometriosis of the rectovaginal septum.