<prompt> All are true statements about pheochromocytoma except?90 are malignant95 occur in the abdomenThey secrete catecholaminesThey arise from sympathetic ganglia  <response>: Discussing options one by one: Option 1 - False - 90 of pheochromocytomas are benign only 10 are malignant Option 2 - True - Almost 95 of tumors are abdominal in location, since 90 arise from adrenal medulla Option 3 - True - These tumors secrete catecholamines like epinephrine, norepinephrine, dopamine Option 4 - True - Extra-adrenal pheochromocytomas occur in sympathetic ganglia in neck, mediastinum, bladder, organ of Zukercandl Rule of 10s in pheochromocytoma 10 are bilateral 10 are extra-adrenal 10 are malignant 10 occur in children 10 are not associated with hypeension 