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Meningeal nodules in teratoma of the testis
1Sikl's Department of Pathology, Medical Faculty Hospital, Pilsen, Czech Republic. michal@fnplzen.cz
Abstract:
A case of a 52-year-old man with a mature adult teratoma is reported. Beside histologically mature tissues, this teratoma contained large areas of a meningiomatous proliferation in close proximity of a peripheral nerve and glial tissue. These meningiomatous proliferations were mostly seen in the peripheral parts of the teratoma surrounding the rest of teratomatous elements and were immunohistochemically EMA-positive and S-100 protein- and cytokeratin-negative. Identical meningothelial proliferations are well known in the skin and adjacent soft tissues of the scalp, where they have variously been called sequestrated meningoceles, meningeal hamartoma, cutaneous meningiomas, rudimentary meningocele, hamartoma of the scalp with ectopic meningothelial elements, or cutaneous heterotopic meningeal nodules.
Insights
This case report details a mature teratoma containing meningiomatous proliferation. The study highlights the immunohistochemical profile and location of these meningothelial elements within the teratoma.
Area of Science:
- Neuropathology
- Surgical Pathology
- Developmental Biology
Background:
- Teratomas are germ cell tumors containing diverse tissue types.
- Meningiomatous proliferations, typically found in the scalp, are well-documented.
- The co-occurrence of these elements within a teratoma is unusual.
Observation:
- A 52-year-old male presented with a mature adult teratoma.
- The teratoma exhibited mature tissues alongside significant meningiomatous proliferation near peripheral nerve and glial tissue.
- Immunohistochemistry revealed EMA-positivity and negativity for S-100 protein and cytokeratin in the meningiomatous areas.
Findings:
- The meningiomatous proliferations were predominantly located peripherally within the teratoma, surrounding other teratomatous components.
- These findings suggest ectopic meningothelial elements within a teratoma, analogous to cutaneous meningiomas found in the scalp.
Implications:
- This case expands the understanding of teratoma composition and the potential for heterotopic tissue differentiation.
- It provides a neuropathological perspective on the origin and characteristics of meningiomatous proliferations in extraneural locations.
- Further research may elucidate the developmental pathways leading to such complex teratomas.