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Malignant transformations in mature cystic teratomas: A case report and literature review

  • Authors:
    • Oğuzcan Özkan
    • Asli Geçgel
    • Pinar Peker
    • Erhan Gökmen
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, Ege University Faculty of Medicine, 35100 Izmir, Turkey, 2Department of Medical Oncology, Adana State Hospital, 01170 Adana, Turkey
    Copyright: © Özkan et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY 4.0].
  • Article Number: 52
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    Published online on: July 7, 2025
       https://doi.org/10.3892/mi.2025.251
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Abstract

Testicular teratomas, although generally benign, may rarely undergo malignant transformation into somatic cancers, most notably, adenocarcinomas. The incidence of malignancy transformation in ovarian teratomas is well‑established at ~2%; however, it is extremely uncommon for testicular and extragonadal teratomas to undergo such transformations. The present study describes a unique case of a testicular teratoma that underwent malignant transformation into mucinous adenocarcinoma. The pathophysiology underlying testicular teratoma transformation remains incompletely understood, with several mechanisms proposed, including the malignancy of totipotent embryonal carcinoma cells or the malignant differentiation of mature teratomatous elements. Additionally, secondary malignancy, often induced by chemotherapy or radiotherapy, is also a contributing factor in certain cases. Immunohistochemical analyses play a crucial role in diagnosing these rare malignancies, with markers such as CDX2, CK20 and CK7 helping to differentiate the adenocarcinoma phenotypes. Despite the rarity of such cases, it is imperative to recognize the potential for aggressive progression, particularly when adenocarcinoma is involved, as these cases require intensive management, including chemotherapy and, sometimes, surgical intervention. The present study emphasizes how crucial early discovery is for improving prognosis and treatment results for individuals with malignant transformation of testicular teratomas, as well as the value of a multidisciplinary approach. Given the limited number of reported cases and lack of standardized management guidelines, the timely documentation and analysis of such rare presentations are essential to guide future clinical decision‑making.
View Figures

Figure 1

Computed tomography image of the
retroperitoneal mucinous adenocarcinoma lesion arising from a
teratoma. Contrast-enhanced axial CT image demonstrating a
heterogeneous retroperitoneal mass with cystic and solid
components, consistent with teratoma-derived adenocarcinoma
following chemotherapy for relapsed testicular germ cell tumor. In
this CT image, the tumor along with a 40-mm lymphadenopathy (LAP)
complex that was developed as a result can be observed.
View References

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Copy and paste a formatted citation
Spandidos Publications style
Özkan O, Geçgel A, Peker P and Gökmen E: Malignant transformations in mature cystic teratomas: A case report and literature review. Med Int 5: 52, 2025.
APA
Özkan, O., Geçgel, A., Peker, P., & Gökmen, E. (2025). Malignant transformations in mature cystic teratomas: A case report and literature review. Medicine International, 5, 52. https://doi.org/10.3892/mi.2025.251
MLA
Özkan, O., Geçgel, A., Peker, P., Gökmen, E."Malignant transformations in mature cystic teratomas: A case report and literature review". Medicine International 5.5 (2025): 52.
Chicago
Özkan, O., Geçgel, A., Peker, P., Gökmen, E."Malignant transformations in mature cystic teratomas: A case report and literature review". Medicine International 5, no. 5 (2025): 52. https://doi.org/10.3892/mi.2025.251
Copy and paste a formatted citation
x
Spandidos Publications style
Özkan O, Geçgel A, Peker P and Gökmen E: Malignant transformations in mature cystic teratomas: A case report and literature review. Med Int 5: 52, 2025.
APA
Özkan, O., Geçgel, A., Peker, P., & Gökmen, E. (2025). Malignant transformations in mature cystic teratomas: A case report and literature review. Medicine International, 5, 52. https://doi.org/10.3892/mi.2025.251
MLA
Özkan, O., Geçgel, A., Peker, P., Gökmen, E."Malignant transformations in mature cystic teratomas: A case report and literature review". Medicine International 5.5 (2025): 52.
Chicago
Özkan, O., Geçgel, A., Peker, P., Gökmen, E."Malignant transformations in mature cystic teratomas: A case report and literature review". Medicine International 5, no. 5 (2025): 52. https://doi.org/10.3892/mi.2025.251
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