Abstract
Craniopharyngiomas are rare epithelial tumors of the sellar and parasellar region. They are biologically benign but may cause significant morbidities. The 2016 World Health Organization classification distinguishes two subtypes: adamantinomatous craniopharyngioma (ACP) and papillary craniopharyngioma (PCP). These two subtypes are characterized by distinctive histopathological and molecular features. ACP occurs in both children and adults. It shows invasive borders and frequent regressive changes including calcifications, cholesterol deposition, old hemorrhages, and fibrosis. Histopathologically, ACP consists of epithelial clusters with an outer palisading epithelium, a stellate reticulum, and aggregates of “wet keratin.” ACP is characterized by an activation of the Wnt/β-catenin pathway due to mutations in exon 3 of the CTNNB1 gene. PCP is typically an adult tumor and is usually more circumscribed than ACP. PCP is composed of papillae covered by a regular non-keratinizing squamous epithelium. Molecularly, PCP is characterized by an activation of the MAPKinase pathway due to BRAF V600E mutation.
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Vasiljevic, A., Villa, C. (2020). Histopathology and Molecular Pathology of Craniopharyngioma in Adults. In: Jouanneau, E., Raverot, G. (eds) Adult Craniopharyngiomas. Springer, Cham. https://doi.org/10.1007/978-3-030-41176-3_1
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