Rathke's Cleft Cysts
Rathke's Cleft Cysts are not tumours, but instead are classified as developmental abnormalities.
Like craniopharyngiomas, these cysts form during early development of the foetus from a structure known as Rathke's pouch. Small Rathke's cleft cysts are not uncommon and do not usually cause any symptoms. Problems can occur if these cysts enlarge and interfere with pituitary production or exert pressure on the optic chiasm.