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Gangliogliomas centered in the conus (a,b,d,e) and occipital cortex (c,f) in individuals with NF1. CD34 expression may be seen (e) as in sporadic gangliogliomas. Dysembryoplastic neuroepithelial tumor forming mucoid cortical nodules (arrows)(g) and containing floating neurons on high power (h). Rosette forming glioneuronal tumors also may occur in individuals with NF1, often outside the posterior fossa (i).
