A Rathke's cleft cyst is a noncancerous fluid-filled cyst that develops in the pituitary region from remnants of embryonic tissue. Most are found unexpectedly and cause no symptoms. An MRI may show a fluid-filled structure in the pituitary region consistent with a Rathke's cleft cyst. Finding a Rathke's cleft cyst allows for monitoring to ensure it remains stable and does not affect pituitary function.
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