VIN 1Vulvar Intraepithelial Neoplasia Grade 1 (also seen as VIN I)
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In making this transition, it was recognized that VIN 1 is not in fact an oncogenic lesion and is now solely referred to as condyloma acuminatum.
This terminology applies only to HPV-related lesions (usual type) and considers the VIN 1 or condyloma accuminatum to be a low-grade lesion (LSIL), and VIN 2-3 or usual type to be high-grade lesions (HSIL).
Before then, it paralleled the CIN classification system, with three grades of intraepithelial neoplasia corresponding to the thickness of the epithelium filled by dysplastic cells: VIN 1, 2, and 3.