Researchers have identified a genetic rearrangement that may drive the development of a rare benign brain tumor in children. The rearrangement, which causes parts of two genes to fuse, may spur the growth of tumors through three distinct biological mechanisms simultaneously, the researchers found. The study focused on angiocentric gliomas, a rare subtype of low-grade pediatric tumors that was first described less than a decade ago. Fewer than 30 cases have been reported in the scientific literature. Based on their findings, the study authors propose that angiocentric gliomas should be classified as a distinct biologic entity and that the presence of the gene fusion should be used to confirm the diagnosis.