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New aspects of vulvar cytology.

Smears were taken from vulvar skin in 203 cases (83 normal-appearing, 23 benign, 12 precancerous and 85 malignant conditions). Three cases were analyzed by electron microscopy. The appearance of dyskeratotic cells was regarded as a sign of malignancy; this was supported by ultrastructural study. Smears from normal vulvar skin revealed a high correlation between age and presence of nucleated keratinized squames, which occurred most often in the third and rarely in the eighth decade. Benign conditions showed cellular features like those of the normal vulva. In precancerous lesions, 58% of the smears showed dyskeratotic cells. Malignant conditions showed dyskeratotic cells in 66% of the smears and true cancer cells exclusively in an additional 14%. Our observations indicate that vulvar cytology can be a major diagnostic aid in all suspicious cases, especially in the elderly. Vulvar cytology cannot replace an exact histologic examination, but it can provide a reason for taking a biopsy earlier than might otherwise be the case.