Primary spontaneous complete colporrhexis.

Spontaneous rupture or avulsion of the vagina from the cervix during labour is a rare condition. The term colporrhexis describes this obstetric injury and it is subdi­ vided into primary or secondary, spontaneous or traumatic, complete or incomplete. Incomplete colporrhexis includes rupture of the vaginal epithelium and the muscularis, whereas complete involves the overlying peritoneum as well. Primary colporrhexis is a vaginal vault tear not asso­ ciated with cervical or uterine extension. Secondary colporrhexis cannot be differentiated from a rupture that has originated in the uterus and then extended to involve the vagina (1).