A previous case report exists of simultaneous GH-secreting pituitary micro-adenoma with a Rathke cleft cyst, causing compression of the optic chiasm with resultant visual field defects.25 Adenomas in this situation usually secrete prolactin.26 This is probably due to stalk compression from the cyst with resultant lactotroph hyperplasia. The gene discussed is GH1; the disease is cyst.