grade I astrocytoma

grade I as·tro·cy·to·ma

solid or cystic astrocytoma of low grade; World Health Organization designation including pilocytic astrocytoma and other low-grade astrocytoma variants.

grade I as·tro·cy·to·ma

(grād as'trō-sī-tō'mă)
Solid or cystic astrocytoma of high differentiation or low grade.