SERPINA3 and Adamantinomatous Craniopharyngioma: AACT is also an abundant component of the cystic fluid collected from adamantinomatous craniopharyngioma [57,58] another cystic intracranial tumor that originates from the craniopharyngeal duct [59] and not from derivatives of neuroepithelium or neural crest such as the intracranial cystic tumors we investigated.