Typical cases of external genital warts can be diagnosed by naked eye. Patients with external genital warts should have a thorough examination of the vagina and cervix to avoid missed diagnosis. For those with atypical signs, auxiliary examinations are needed to confirm the diagnosis. The main auxiliary examinations include the following:
Cytological examination
Empty cells can be seen, characterized by large nuclei in the middle layer of cells, and sometimes double nuclei can be seen, with deeply stained nuclei and large empty spaces around the nuclei. Although the specificity of empty cells is high, the detection rate of empty cells is low.
Vaginoscopy
Vaginoscopy is very helpful in detecting cervical lesions. Typical lesions are characterized by a central vascular loop under the semi-transparent epidermis of each papillary projection. After applying 3% acetic acid to the cervix, white plaque-like areas can be seen in the transitional zone, with elevated and uneven or small papillary-like projections, central capillaries, and can also be presented as flower-like or finely镶嵌ed dots.
Pathological tissue examination
External genital warts show outward growth under the microscope, with small and dense papillae proliferation, and superficial cells with incomplete or excessive keratinization; the stratum spinosum is highly proliferative, with empty cells appearing, which are characteristic changes of HPV (Human Papillomavirus) infection; the basal cells proliferate, the dermis swells, the capillaries dilate, and there is chronic inflammatory cell infiltration around.
Polymerase Chain Reaction (PCR)
PCR is simple, rapid, sensitive, and specific. It can detect extremely small amounts of HPV DNA, not only to confirm whether there is HPV infection, but also to determine the type of HPV. Pay attention to take fresh lesions from the surface scraping or tissue to improve the positive rate.
Nucleic Acid DNA Probe Hybridization
In situ hybridization is used more frequently. In situ hybridization is a direct hybridization reaction performed on tissue sections or cell smears, and is checked under a light microscope. This method is helpful in distinguishing suspicious histological lesions.