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