Fig. 2From: Low grade astrocytoma transformating primitive neuroectodermal tumour in an adult? A case report and review of literatureHistopathologic and immunohistochemical features in this case of adult PNETs.: a a diffuse astrocytoma: a prominent microcystic background from the H&E stain. b Homer-Wright rosettes. c Tumors were mainly composed of undifferentiated tumor cells, with hyperchromatic nuclei. d CD99 (+). e GFAP(+). f synaptophysin(+). g NSE(+). h Vimentin(+). i CD56(N-CAM) (+)Back to article page