In our study, conducted on 28 patients diagnosed with GH-secreting pituitary adenomas, 9 microadenomas (32.1%) and 19 macroadenomas (67.9%) of which 3 were GH and PRL mixed secreting pituitary adenomas (10.7%) were identified by using Magnetic Resonance Imaging. The gene discussed is PRL; the disease is pituitary gland adenoma.