Hypertension is a rare but well-documented manifestation of neuroblastoma. This is a case in which a hypertensive 8 month-old male with a large left adrenal mass was diagnosed as pheochromocytoma and prepared for surgery with alpha adrenergic blockers and beta adrenergic blockers. Vital signs prior to induction of anesthesia and during surgery also mimicked pheochromocytoma but pathologic examinations revealed neuroblastoma. Laboratory findings also supported pheochromocytoma taking into account the fact that hypertension is rare in neuroblastomas.