Most women getting radiation to the pelvis develop vaginal drying as a side effect of the radiation treatment. This problem is common and managed by the radiation oncologist. It can potentially lead to vaginal stenosis in some patients (stricture of the vagina). At the end of radiation to the pelvic area, woman are typically given a vaginal dilator that is inserted into the vagina for a few minutes daily to separate the tissue surfaces. This is done to prevent scarring that can contribute to vaginal stenosis.
http://www.oncolink.upenn.edu/experts/article.cfm?c=3&s=15&s...

..drobny zabieg ope­ra­cyjny, po któ­rym przez pewien czas noszony był roz­szer­zacz pochwy (dila­tor)..
http://vulvodynia.pl/2009/vestibulitis-przyczyny-bolu/

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Note added at   40 min (2010-05-03 13:55:07 GMT)
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Vaginal dilators are used in a variety of clinical situations, including the treatment of vaginismus, avoidance of vaginal adhesion, and stenosis following radiation therapy.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2258477/