Impression Abnormal Mammogram Can You Explain The Relationship Between Catecholamines And Metanephrines?

Can you explain the relationship between Catecholamines and metanephrines? - impression abnormal mammogram

Ok, I know that they tested in a way, the analysis of urine within 24 hours. Then fractionated plasma free metinephrines free, whether it is normal. However, only saying that pheosarcoma diagnostic tests, but it should also be able to diagnose a neuroblastoma, because it produces catecholamines and had the impression that catecholamines formed from metinephrine? Can someone please clarify this for?