PRL and adenoma: Metabolites:▸ phosphoethanolamine, glutamate, glutamine, N-acetyl aspartate, aspartate and myo-inositol - significantly altered in both types of adenomas▸ down regulation of phosphoethanolamine, N-acetyl aspartate and myo-inositol and up regulation of aspartate, glutamate and glutamine in PRL-secreting PA compared to gonadotropin-secreting PA