This patient went on to have a craniotomy and resection of the mass.
Microscopic Description: Sections show the lesion is comprised of squamous epithelium, which tends to form a prominent basal layer without keratohyaline. Within the other layers there are varying degrees of separation of individual cells with prominent intercellular bridges. The epithelium rests on a fibrovascular stroma within which there are varying degrees of hyalinization of blood vessels and the stroma. In some areas the lesion is adjacent to brain parenchyma which shows reactive astrocytes, fibrillary astrocytes and in some areas Rosenthal fibres. Focal perivascular chronic inflammatory infiltrates are seen in some regions of the fibrovascular stroma. There are also occasional lipid-laden macrophages seen in the stroma. There are no areas of wet keratin seen. No hemosiderin or cholesterol crystals are seen.
Final Diagnosis: Papillary craniopharyngioma.
feature images from this case