Gangliocytoma Last edited and medically reviewed by Alaric Steinmetz on 27.04.2026 Gangliocytoma is a rare primary Brain tumor (WHO Grade I). EpidemiologyGangliocytoma occurs primarily in children.HistopathologyGangliocytoma is characterized by clusters of neoplastic ganglion cells, often with dysplastic features[^1] [^2].