Figure 4: Representative micrographs of pilocytic astrocytoma (PiA) and oligoastrocytoma (OA) immunostained for nestin, SPARC and IDH1(R132H). The PiA was IDH1(R132H) negative. The case of OA was positive for all three markers. Center of the tumor (c) of the PiA and the OA, as well as the periphery (p) of the OA are depicted. Original magnification x400. Scale bar: 100 μm.