The received specimen consisted of the ilium, 15.0 x 9.0 x 5.0 cm. from a left modified internal hemipelvectomy (Figure 03) with a grossly well-circumscribed tumor, which measured 5.2 x 4.0 x 3.0 cm (Figures 04, 05, and 06). The slices of the ilium from serial parallel sections showed a bulging pink tan to gray white lobulated fleshy tumor with focal whorled pattern. Focal hemorrhage was seen, but no gross necrosis was identified (Figure 05). The tumor was completely encased within bone. The bone surrounding the tumor was expanded, but resection margins appeared intact (Figures 04, 05, and 06). The inked soft tissue surface shown in Figures 05 and 06 represented the areas of exposed tumor when the bone of the sacro-iliac joint was fractured during the operation (Figures 05 and 06). The sacroiliac joint was free of tumoral involvement.
MICROSCOPIC DESCRIPTION & IMMUNOHISTOCHEMICAL AND HISTOCHEMICAL STUDIES