<prompt> Commonest cause of sustained severe hypeension in childrenEndocrine causesCoarctation of aoaRenal parenlchyma diseasePheochromocytoma  <response>: The chief causes of severe sustained hypeension identified included chronic glomerulonephritis , obstructive uropathy , reflux nephropathy , thrombotic microangiopathy and renovascular disease . ref:Harrison;s principles of internal medicine,ed 18,pg no 