PRL and diabetes insipidus: The results revealed statistically significant differences (p < 0.05) in the following factors: preoperative and postoperative PRL levels, maximum tumor diameter, tumor volume, preoperative and postoperative pituitary stalk deviation angle, preoperative and postoperative elevation of the diaphragma sellae, Knosp grade, preoperative serum sodium levels, presence of hyponatremia on postoperative days 1–2, and occurrence of postoperative diabetes insipidus.