The value of endocervical curettage after conization for cervical intraepithelial neoplasia

The objective of this study is to assess the value of postcone endocervical curettage, after conization of cervical intraepithelial neoplasia or carcinoma as a predictive tool for residual lesions. This is a retrospective observational study. All data were obtained by the University Hospital of Zurich, Department of Gynaecology. One hundred fifty patients underwent hysterectomy within 12 months after conization and endocervical curettage from 1993 to 2006. To analyze the sensitivity, specificity, and the positive predictive value (PPV) and negative predictive value (NPV) of the endocervical curettage after conization, we used the Fisher exact test and χ2 test. The main outcome measures are the sensitivity and specificity as well as the PPV and NPV of the postconization endocervical curettage. The endocervical curettage exhibited a sensitivity of 0.38, a specificity of 0.85, a PPV of 0.56, and an NPV of 0.73. Comparing patients younger than 50 years to women 50 years or older, endocervical curettage had a sensitivity of 0.35 and 0.44, a specificity of 0.83 and 0.94, a PPV of 0.46 and 0.88, and an NPV of 0.76 and 0.63, respectively. The endocervical curettage after conization of cervical intraepithelial neoplasia does not generally improve the prediction of residual lesions. However, in women 50 years or older, a higher specificity and PPV, 0.94 and 0.88, respectively, was observed. Therefore, this subgroup of patients may benefit from an endocervical curettage.