low grade vulvar intraepithelial neoplasia (MONDO_0006274, a Monarch Disease Ontology entry) is an intraepithelial lesion of the vulvar squamous epithelium that represents the clinical and morphological manifestation of a productive HPV infection. Low grade refers to the associated low risk of concurrent or future cancer. (WHO, 2014). Also known as: VIN 1, VIN 1 of usual type, VIN grade 1, grade 1 VIN, grade 1 vulvar intraepithelial neoplasia, grade I VIN, grade I vulvar intraepithelial neoplasia, intraepithelial neoplasia of the vulva grade 1.