Two novel tumours with NTRK2 fusion in the methylation class of extraventricular neurocytomas, including one intraventricular.

This article discusses two novel tumors classified as extraventricular neurocytomas (EVN) that were found to have NTRK2 fusions instead of the usual FGFR1 alterations. The first case involved a 23-year-old woman with migraines and epileptic seizures, while the second case involved a 15-year-old girl with intracerebral calcifications. Both cases underwent total removal of the tumors and showed positive staining for synaptophysin and olig2. The study suggests that these findings have implications for diagnosis, therapy, and terminology, and further research is needed to better understand these tumors. [Extracted from the article]