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The vaginal vault is the expanded region of the vaginal canal at the internal end of the vagina.
Prolapse
The vaginal vault may prolapse after a hysterectomy, as there is no uterus supporting the interior end of the vagina. The incidence of vaginal vault prolapse is approximately 15% after hysterectomy due to uterine prolapse, and approximately 1% after hysterectomy due to other reasons.
Colposacropexy is the gold standard for treating vaginal vault prolapse, by attaching the top of the vagina to the sacrum.
References
Vaginal vault Wikipedia(Text) CC BY-SA