Endometriotic cyst mimicking recurrence after treatment for ovarian immature teratoma: a case report - Report - MDSpire

Endometriotic cyst mimicking recurrence after treatment for ovarian immature teratoma: a case report

  • By

  • Ying Dong

  • Yue Deng

  • Youfang Hou

  • Rongji Li

  • Lihua Yang

  • June 9, 2026

  • 0 min

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Clinical Report: Endometriotic Cyst Resembling Tumor Recurrence Following Treatment

Overview

This case study discusses a 23-year-old woman with a history of ovarian immature teratoma who developed an adnexal mass during follow-up. The mass was managed conservatively with GnRH-a therapy, resulting in significant reduction and preservation of ovarian function.

Background

Endometriosis is a prevalent condition among reproductive-age women, with a notable incidence in those facing fertility challenges. The differentiation between tumor recurrence and benign lesions like endometriotic cysts is crucial, particularly in young patients who have undergone treatment for malignant ovarian tumors. Misdiagnosis can lead to unnecessary surgical interventions that may compromise fertility.

Data Highlights

No numerical data or trial data presented in the article.

Key Findings

  • A 23-year-old woman with ovarian immature teratoma developed a left adnexal mass during follow-up.
  • Imaging suggested a hemorrhagic endometriotic cyst, while tumor markers remained normal.
  • A trial of GnRH-a therapy led to a significant decrease in the mass size from 5.7×4.5cm to 1.4×0.9cm.
  • At one-year follow-up, the patient maintained regular menstrual cycles and preserved ovarian reserve (AMH >2ng/mL).
  • This case highlights the potential for hormonal therapy as an alternative to surgery in selected patients.

Clinical Implications

The case illustrates the importance of careful monitoring and individualized management strategies in young women with a history of ovarian malignancy. Hormonal therapy may be a viable option to avoid surgery while preserving fertility in cases of suspected endometriotic cysts.

Conclusion

This case underscores the need for a thorough diagnostic approach and consideration of conservative management options in young patients with adnexal masses post-treatment for ovarian tumors.

Related Resources & Content

  1. Frontiers in Oncology, 2026 -- Case Report: Ovarian dysgerminoma mimicking a sex cord-stromal tumor with hyperandrogenism: diagnostic challenges and molecular insights
  2. International Journal of Colorectal Disease, 2026 -- Management of a rare entity; a intramuscular caecal epidermoid cyst, in the robotic surgery era: a video case report
  3. Frontiers in Oncology, 2026 -- Cytoreductive Surgery for Ovarian Cancer with Pelvic Ectopic Kidney: A Case Report
  4. Immature Teratoma of the Ovary—A Narrative Review, 2025
  5. Growing teratoma syndrome of the ovary: a case report and literature review, 2024
  6. Frontiers in Oncology — Case Report: Intramyometrial Uterine Large-Cell Neuroendocrine Carcinoma Mimicking Adenomyosis and Leiomyomas With Rapid Fatal Relapse
  7. NCCN Ovarian Cancer Guidelines, 2026
  8. ACOG Publishes New Endometriosis Clinical Guidance, 2026
  9. Immature Teratoma of the Ovary—A Narrative Review
  10. Frontiers | Growing teratoma syndrome of the ovary: a case report and literature review
  11. Transvaginal ultrasound and magnetic resonance imaging in the diagnosis of endometrioma: a systematic review and meta-analysis of diagnostic test accuracy studies - PubMed

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