A craniopharyngioma is a benign (noncancerous) tumor arising from small nests of cells near the pituitary stalk. Crangiopharyngiomas are localized tumors and become large before they are diagnosed. How malignant they are and how quickly they are likely to spread are unknown.
Adamantinomatous (ordinary) craniopharyngioma occurs in children and tends to be less solid than papillary craniopharyngioma. Papillary craniopharyngioma occurs in adults and is a more solid tumor.