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[0] Rathke's cleft cyst [1] Uncommon [2] Cystic enlargement of remnants of Rathke's pouch. [3] Pituitary. The smaller cyst are usually identified as a small cyst at the interface of the anterior and posterior pituitary; most of these small cysts are asymptomatic. [4] Symptoms are due to compress of local structures and may lead to headache, hypopituitarism, hyperprolactinemia, visual disturbance and, rarely, diabetes insipidus. [6] The cyst is lined by a single layer of cuboidal to columnar, ciliated or mucin-producing epithelium. Squamous metaplasia may occur and raises the possibility of a craniopharyngioima. Occasional cells of anterior pituitary gland may be present. Rathke cleft cyst cannot be histologically differentiated from colloid cyst of the third ventricle. Clinical correlationis important. [5] 
Well-defined, small, thin walled cyst with a watery to mucinous, occasionally xanthochromatic due to prior hemorrhage, content.
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