INTRAEPITHELIAL NEOPLASIA OF THE VULVAR SQUAMOUS EPITHELIUM. THERE IS NO EVIDENCE OF INVASION. THIS CATEGORY INCLUDES VULVAR HIGH GRADE SQUAMOUS INTRAEPITHELIAL LESION AND VULVAR INTRAEPITHELIAL NEOPLASIA, DIFFERENTIATED TYPE.
Vulvar intraepithelial neoplasia (VIN) refers to particular changes that can occur in the skin that covers the vulva. VIN is an intraepithelial neoplasia, and can disappear without treatment. VINs are benign but if the changes become more severe, there is a chance of cancer developing after many years, and so it is referred to as a precancerous condition.