These terms can be used interchangeably but usually paraganglioma refer to a tumor originating from chromaffin cells outside the adrenal gland, which can also be called extra-adrenal pheochromocytoma, whereas pheochromocytoma typically refer to a tumor originating from the chromaffin cells within the adrenal gland.
These terms can be used interchangeably. Paraganglioma refer to a tumor. This tumor is originating from chromaffin cells outside the adrenal gland. The adrenal gland can also be called extra-adrenal pheochromocytoma. Pheochromocytoma typically refer to a tumor. This tumor is originating from the chromaffin cells within the adrenal gland.