Needle versus loop diathermy excision of the transformation zone for the treatment of cervical intraepithelial neoplasia: a randomised controlled trial.

Objective: To determine whether lower rates or incomplete resection of cervical intraepithelial neoplasia (CIN) may be achieved by needle excision of the transformation zone (NETZ) than with loop excision (LLETZ).

Design: A prospective randomised controlled trial.

Setting: A gynaecological oncology centre and a teaching hospital in West London.