<prompt> True about pheochromocytoma isArises from chromaffin cells of adrenal medullaBilateral in 20 of all casesHypotension rules out pheochromocytomaAlmost always a malignant tumor  <response>: 10 are bilateral 10 are malignant 10 occur in pediatric patients 10 are extra-adrenal 10 are familial 