Positive staining of synaptophysin (Syn) was seen in 28 of 38 (73.7%) pheochromocytomas and 6 of 21(28.6%) adrenocortical carcinomas.

• Syn:嗜铬细胞瘤阳性率73.；7%25 (28 /38)；肾上腺皮质癌阳性率28