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Central Nervous System Embryonal Tumour With PLAGL Amplification Lacking Typical Embryonal Morphology: Diagnostic
Ryo Okuse1,2, Sumihito Nobusawa3, Akira Kurose1
1Department of Anatomic Pathology, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori, Japan.
Neuropathology and Applied Neurobiology
|June 26, 2026
Summary
Central nervous system embryonal tumors with PLAGL1 amplification can lack typical features. Diagnosis relies on DNA methylation profiling and fluorescence in situ hybridization, crucial for identifying this rare pediatric tumor.
Area of Science:
- Neuro-oncology
- Molecular Pathology
- Pediatric Oncology
Background:
- Central nervous system embryonal tumors are a group of malignant brain tumors.
- Some entities are defined by molecular alterations, such as DNA methylation profiles.
- Morphological features can sometimes be atypical or misleading.
Purpose of the Study:
- To highlight a case of central nervous system embryonal tumor with PLAGL1 amplification.
- To emphasize the importance of molecular diagnostics when morphology is discordant.
- To prevent diagnostic pitfalls in pediatric neuro-oncology.
Main Methods:
- DNA methylation profiling was used to define the tumor entity.
- Fluorescence in situ hybridization (FISH) confirmed PLAGL1 gene amplification.
- Histopathological review assessed tumor morphology.
Main Results:
- The tumor lacked typical embryonal morphology.
- DNA methylation profiling identified a specific tumor entity.
- FISH confirmed PLAGL1 amplification, a key molecular driver.
Conclusions:
- Morphology-molecular discordance is a recognized challenge in diagnosing CNS embryonal tumors.
- Molecular profiling, including DNA methylation and FISH, is essential for accurate diagnosis.
- Early recognition of these discrepancies aids in appropriate patient management and treatment stratification.
