Introduction: Complete occlusion of the cervical canal following conization is an uncommon complication.
Case report: We encountered a case in a woman with lactation amenorrhea who after conization to treat cervical intraepithelial neoplasia (CIN) 3 developed hematometra and did not resume menstruation. This case was diagnosed early by ultrasonic tomography and magnetic resonance imaging (MRI).
Conclusion: Postpuerperal amenorrheic women should be managed with care because of the increased risk of occlusion of the cervical duct after conization.