Magnesium sulfate is used in the treatment of both pheochromocytoma and preeclampsia because it reduces BP, inhibits catecholamine release, blocks peripheral catecholamine receptors, and causes vasodilation.15 Definitive treatment of preeclampsia is delivery of both the baby and the placenta.8 In the case of our patient, the fetus did not survive the patient’s hypertensive crisis, and surgical resection of the adrenal mass was deferred until after stabilization and discharge to an outside facility. The gene discussed is ADRB2; the disease is hereditary pheochromocytoma-paraganglioma.