Typical MRI scan changes in prolactinomas adenoma. An enhancing mass lesion is seen in the sella turcia under the T1-weighted postcontrast MRI scan performed 1 year after MASEP GKRS, but the volume of the mass had collapsed for more than 50%. Patient 2's clinical symptom did improve. Her serum prolactin level came down to 14.5 ng/ml, and she got gestation and delivered a healthy baby recently.