The patient went on to have transphenoidal surgery.
The sections show a cyst lined by a combination of ciliated columnar epithelial cells containing goblet cells and squamous epithelial cells. Separate from the cyst is a solid arrangement of mature squamous epithelium surrounding fibrovascular cores. No mitotic figures or areas of necrosis are identified. The features are of papillary craniopharyngioma.
Final diagnosis: Papillary craniopharyngioma