19-Iodocholesterol

19-Iodocholesterol is a derivative of cholesterol with an iodine atom in the 19-position. When the iodine atom is a radioactive isotope (iodine-125 or iodine-131), it is used as an adrenal cortex radiocontrast agent for in the assessment of patients suspected of having Cushing's syndrome, hyperaldosteronism, pheochromocytoma and adrenal remnants following total adrenalectomy.