<prompt> True about adrenal pheochromocytoma isChromaffin negativeMostly malignantBilateral in 10 percnt casesUnilateral in 10 percnt cases  <response>: Refernce Robbins page no 1134 The 10 percent rule forpheochromocytomaparaganglioma--10 familial, 10 malignant, 10 extra-adrenal--is therefore no longer tenable. Current roles of pathology are limited to diagnosing primary or metastatic tumors and identifying features suggestive of malignant potential or hereditary disease. 