A transverse septum can form during embryogenesis when the mullerian ducts fuse improperly to the urogenital sinus. A complete transverse septum will block menstrual flow and is a cause of primary amenorrhea. The accumulation of menstrual debris behind the septum is termed cryptomenorrhea. Some transverse septa are incomplete and may lead to dyspareunia or obstruction in labor. A surgical incision will relieve the situation.
^Varras M, Akrivis C, Demou A, Kitsiou E, Antoniou N (March 2007). "Double vagina and cervix communicating bilaterally with a single uterine cavity: report of a case with an unusual congenital uterine malformation". J Reprod Med52 (3): 238–40. PMID17465296.