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Updated: Jul 18, 2026

Teratoma Generation in the Testis Capsule
Published on: November 7, 2011
Mixed or metachronous germ-cell tumor?
Kyu-Won Shim1, Dong-Seok Kim, Joong-Uhn Choi
1Department of Neurosurgery, Brain Korea 21 Project for Medical Science, Brain Research Institute, Yonsei University College of Medicine, Seoul, South Korea.
Objective And Importance:
We report the extremely rare occurrence of a second germ-cell tumor at a different site and with different histological types long after total resolution of a pineal germinoma.
Clinical Presentation:
A 21-year-old man who presented with headache and diplopia was admitted to our hospital. Neuroradiological studies revealed a tumor in the pineal region. The tumor was biopsied with endoscope, and third ventriculostomy was performed. Histologically, the tumor proved to be a germinoma. The patient received 3 cycles of combination chemotherapy consisting of carboplatin and etoposide with radiotherapy. The tumor was totally resolute. Twelve months later, he was readmitted with headache and diplopia. Neuroradiological studies showed a tumor in the right temporal lobe.
Intervention:
The second tumor was totally removed. Histologically, the tumor proved to be a mixed germ-cell tumor, which consisted a yolk-sac tumor and a germinoma. After the second course of chemotherapy, magnetic resonance image studies revealed no evidence of the tumor.
Conclusion:
The second tumor was considered to be a metachronous neoplasm rather than a recurrence of the original mixed germ-cell tumor, which consisted a yolk-sac tumor and a germinoma.
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