Abstract

Diffuse pediatric-type high-grade glioma H3-wildtype and IDH-wildtype (pHGG H3/IDH WT) is a heterogeneous entity that is currently defined by a combination of highly malignant morphology, glial or primitive neuroectodermal differentiation, and a number of molecular features. Depending on the DNA methylation profile in pHGG H3/IDH WT, three molecular subgroups are distinguished, one of which (pHGG MYCN) is characterized by amplification of the indicated gene. We report a unique case of pHGG H3/IDH WT in a 19-year-old girl with a deletion of the MYCN gene and constitutional mismatch repair deficiency syndrome.

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