Conservative treatment of carcinoma in situ: a clinical report concerning 866 cases after conization

Carbon dioxide laser for combination excisional-vaporization conization

Extensive cervical intraepithelial neoplasia may simultaneously involve large areas of the ectocervix, even extending to the vaginal fornices, as well as the endocervical canal. In such instances conventional sharp knife conization would result in virtual removal of the cervix if the surgeon wished to completely circumscribe the entire lesion. By combining a narrow carbon dioxide laser excisional conization with ectocervical vaporization, cervical intraepithelial neoplasia may be eradicated by a virtually bloodless surgical procedure and fertility may be preserved. Sixty-one combination conizations with 6 months to 4 years of follow-up are reported. In 95% of the cases biopsy demonstrated cervical intraepithelial neoplasia in three or more ectocervical quadrants, and 16% had extension of disease into the vagina. The technique of combination conization uses 20 to 30 W of power and 1/2 to 1 mm spots for excision and 10 to 15 W and 1 to 1.5 mm spots for vaporization. The average time to complete the entire procedure was 21 minutes. In three of 61 cases endocervical margins were positive; there were no instances of persistence of neoplasia at either the ectocervical or the vaginal margins. Four complications were observed, all related to delayed bleeding; however, only two patients required the placement of a suture. The volume of tissue removed by a large excisional conization is more than two times greater than that of a laser combination conization.