MRI report is in: ”A Rathke cleft cyst is a benign, fluid-filled sac that develops in the pituitary gland, typically between the anterior and posterior lobes. It's formed during embryonic development when the Rathke's pouch, which normally gives rise to the pituitary gland, doesn't close completely, leaving a fluid-filled space." Might need another similar-duration MRI specific to that area to see if it is impacting the pituitary gland at all. Surgery to drain this sac is pretty highly developed now and they do an endoscope through your nose. Many people have these and have no noticeable effect, so maybe it just gets left alone. Definitely something to talk about with the doctors.