The patient went on to have a resection. 

Histology

Paraffin sections show a partially cystic/partially solid tumor composed of irregularly shaped islands of epithelium. These have peripheral basaloid cell layers, central stellate reticulum and central keratinizing squamous epithelium. Focal dystrophic calcification is noted. The features are of adamantinomatous craniopharyngioma.

FINAL DIAGNOSIS: Adamantinomatous craniopharyngioma.