VASH2 and central nervous system neoplasm: Currently, there are no reports on the role and mechanism of VASH2 in CNS tumors, especially in pediatric medulloblastoma, both at home and abroad; therefore, it is important to investigate the correlation between VASH2 and the pathogenesis of SHH-type medulloblastoma to enhance the prognosis of children with SHH-type medulloblastoma.