Most women with vulvar intraepithelial neoplasia VIN have no symptoms at all. Vulvar melanoma accounts for about 5 percent of all vulvar cancers. The Cancer of the clitoris etiological factors for clitoral malignancies are infective organisms, cysts, invasion from cancers in the vicinity and metastasis from distant organs. What Is Vulvar Cancer? Sexually transmitted infections STIs: In one of these cases, there was clitoral and renovascular involvement of neurofibromatosis, which resulted in an enlarged phallus with juvenile hypertension Nonomura et al.