The choice of the appropriate treatment depends on the experience of the operator, the availability of the equipment, the size of the lesion and other factors. If the lesion extends into the vagina, laser ablation is more appropriate, allowing treatment of the entire lesion and mastering the depth of treatment. If microinvasive carcinoma or AIS is suspected, cervical conization can provide a histological specimen for diagnosis. Ablation is not appropriate when the cervical canal examination suggests CIN, when colposcopic findings are unsatisfactory, when cytology or colposcopy suggests cancer, or when cancer may be present but not visible after previous treatment.