<prompt> Vanillyl mandelicacid VMA increased inParathyroidismPheochromocytomaMEN-1Addisons disease  <response>: Pheochromocytoma 798- Basic Robbins 8thPHEOCHROMOCYTOMA - Rules of 10s Demonstrating characteristic nests of cells Zellballen with abundant cytoplasm The definite diagnosis of malignancy in pheochromocytoma is based exclusively on the presence of metastasis Diagnosis demonstration of increased excretion of free Catecholamines and their metabolites such as vanillylmandelic acid and metanephrines 