Two subtypes have been defined; adamantinomatous craniopharyngioma (ACP), the commonest tumor of the sellar region in childhood, which frequently harbours mutations in the CTNNB1 gene (encoding beta‐catenin), and papillary (PCP), predominantly a disease of adults, which frequently carry activating BRAF p.V600E mutations 30. The gene discussed is CTNNB1; the disease is pneumocystosis.