Figure 2 :Photomicrographs demonstrati ng a cellular round to spindled cell tumor with interspersed numerous stag horn shaped vascular spaces (a, H & E x 40). Focal necrosis is seen (b, H & E x 40). Massonís trichrome stain shows very litt le collagen depositi on and stromal hyalinizati on (c, H & E x 40). Cellular pleomorphism and atypical mitosis are seen (d, H & E x 200). Photomicrographs showing strong immunopositi vity for CD 34 (e, IHC x 400) and high MIB-1 LI in tumor cells (f, IHC x 400).