Abstract

Pediatric-type diffuse high-grade gliomas (pHGG) are rare, aggressive central nervous system (CNS) malignancies newly classified in the 2021 World Health Organization (WHO) Classification. Extracranial metastasis of pHGG is uncommon, mostly in H3K27M-mutant diffuse midline gliomas. We report that a a 26-year - old H3-wildtype and IDH-wildtype (RTK1 subtype) male developed extensive extracranial metastases after surgery. Despite radiochemotherapy, the disease spread. This case shows extracranial metastasis potential in pediatric - type gliomas, especially RTK1. Recent studies indicate about half of Adolescent and Young Adult (AYA) high - grade gliomas are pediatric - type, and around 40% of extracranial metastases occur in AYA patients. Recognizing this metastatic potential, especially in AYA, is significant for better outcomes.

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Author notes

Jiawen Wu and Rongqiao Zheng are co-first authors and contributed equally to this study

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