Cerebellar primary germ-cell tumor in a young boy
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A rare primary yolk sac tumor was found in a 5-year-old boy's cerebellum. This pediatric brain tumor diagnosis was confirmed by histology and elevated alpha-fetoprotein levels.
Area of Science:
- Pediatric neuro-oncology
- Neuroscience
- Oncology
Background:
- Posterior fossa germ cell tumors are exceptionally rare in pediatric patients.
- Yolk sac tumors are a type of germ cell tumor that can occur in various locations.
Observation:
- A 5-year-old boy presented with headaches, and imaging revealed a cerebellar vermis tumor.
- The tumor showed diffuse enhancement on CT and MRI scans.
- Surgical removal was performed, with initial suspected diagnoses of medulloblastoma or ependymoma.
Findings:
- Histological examination confirmed the tumor as a yolk sac tumor with embryonal carcinomatous components.
- Elevated alpha-fetoprotein levels were detected in the patient's blood and cerebrospinal fluid.
- Further investigations ruled out metastasis from an extracranial primary tumor.
Implications:
- This case highlights the importance of considering rare germ cell tumors in the differential diagnosis of posterior fossa masses in children.
- Accurate diagnosis through histology and tumor marker analysis (alpha-fetoprotein) is crucial for appropriate management.
- Understanding the characteristics of primary intracranial yolk sac tumors aids in developing targeted treatment strategies for pediatric brain tumors.
Abstract:
Germ cell tumors originating in the posterior fossa are very rare. Described herein is a case of primary germ cell tumor (yolk sac tumor) found in the cerebellar vermis. A 5-year-old boy who complained of headache was admitted. CT and MRI revealed a tumor with diffuse enhancement by contrast medium in the right cerebellar vermis. Total removal was performed and a diagnosis of medulloblastoma or ependymoma was suspected. However, the tumor proved to be a yolk sac tumor with embryonal carcinomatous components from histological findings. Abnormally high levels of alpha-fetoprotein were found in blood and cerebrospinal fluid. Extensive examination indicated that the intracranial lesion had not metastasized from a primary extracranial tumor.