The growth was covered by a thin fibrous capsule that contained a few scattered nerve fibers and an occasional collection ... amounts of catecholamines and their metabolites in the urine and ...

abdomen and pelvis every 1-2 years and an annual 24h urine collection for the measurement of metanephrines and catecholamines.

To further investigate the cause of hypertension, MRI of the abdomen was performed, together with blood tests for renin–aldosterone ratio and a 24 h urine collection for catecholamine screen.