The patient went on to have surgery.

Histology

The cyst is covered by partly squamous and partly ciliated columnar epithelium. The underlying tissue shows trabeculae and cords of cells in a vascular stroma. The cells show round to oval nuclei many with basophilic cytoplasm and others with clear, vacuolated cytoplasm. There is no evidence of malignancy.

FINAL DIAGNOSIS: Rathke cleft cyst.