Background

Intrauterine progesterone therapy has been proposed as a potential uterine-sparing treatment for atypical endometrial hyperplasia and adenocarcinoma.

Case

We present a case of an infertility patient with atypical endometrial hyperplasia who was treated with the levonorgestrel-releasing intrauterine system for 6 months. At follow-up, she was noted to have an increasing endometrial thickness on ultrasonography, and biopsy revealed progression of her lesion to adenocarcinoma.

Conclusion

Although there is a need for uterine-sparing treatment for atypical endometrial hyperplasia and early adenocarcinoma, especially in the setting of desired fertility, caution should be exercised. We do not recommend using the levonorgestrel-releasing intrauterine system as a treatment for atypical hyperplasia or adenocarcinoma until further studies demonstrate the efficacy of this treatment.