Figure 1: a) Undifferentiated neuroblastoma, HE, 40X. Neuroblastic cells have large prominent nucleoli. The neuropils are not seen. b) Undifferentiated neuroblastoma, Pap, 40X. Tumor cells possessed bare nuclei with round and oval in shape with anisokaryosis. Small nucleoli are seen. The debris that stained light green and picnotic karyorrhexis are seen in the background.