The absence of amyloid, encountered in 3 cases of this series, can not be considered as the reason of ruling out this tumor from diagnosis, because neurosecretory granules were confirmed in one of these cases. 本组21例中3例无淀粉样物,其中1例电镜证实有神经分泌颗粒,因此无淀粉样物不能排除本瘤。