Loop electrosurgical excision has largely replaced the ablative techniques for treatment of all grades of CIN. Its major advantage is that it produces a tissue specimen, which can be examined to ensure that invasive carcinoma is not present. Recent series have found unexpected microinvasive or invasive squamous lesions in 0.7% of loop specimens and adenocarcinoma in situ in 0.5%. The cure rates from loop electrosurgical excision for all grades of dysplasia average 96%.
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A histologic diagnosis of CIN should be made before proceeding with loop electrosurgical excision. If loop excision is used instead of colposcopic biopsy (the see-and-treat philosophy), negative specimens will be found in 20-40%–an unacceptably high rate. Furthermore, patients with biopsy-proven low-grade lesions may have up to 40% negative loop specimens. Only those patients with highgrade cytology and obvious colposcopic lesions who may not return for treatment may be considered for the see-and-treat technique. This approach has been used in the United Kingdom, where waiting lists for treatment of abnormal cytology are unusually long, and in the United States for health departments or areas where workers move rapidly from one community to the other.
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The management of positive margins at the time of electrosurgical excision is controversial. If the margins suggest invasive cancer, a repeat conization with cold cauterization is indicated because the electrosurgical artifact may interfere with the determination of the depth of invasion. If the patient has a CIN lesion at the margin, follow-up with endocervical sampling and colposcopy at 3 months is indicated. If all margins are negative, two additional examinations 3 months apart are sufficient to establish clearance of the lesion. If the follow-up evaluation result is positive, repeat conization is indicated. A series of loop excisions were reported in which 44% of women had incomplete excision of CIN. Despite this, 95% of the patients remained free of recurrence during follow-up.
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Follow-up of patients treated by any modality should include an endocervical brush cytology specimen and col-poscopy at 3-4 months posttreatment. After a negative first evaluation, patients may be followed with cytologic assessment at 6-month intervals.
Dec 05
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