A pheochromocytoma usually arises from chromaffin tissue of the adrenal medullo, but in may arise from chromaffin tissue of the sympathetic paraganglia as well.

• 嗜铬细胞瘤多起源于肾上腺髓质之嗜铬细胞，但是其它部位之交感神经嗜铬细胞也会产生类似的高血压肿瘤。