From the case: Benign fibrous histiocytoma
Macroscopic view of the resection specimen in transverse orientation. Large yellow osteodestructive tumor originating from iliac bone and with extensive extraosseous parts. Invasion of massa lateralis of sacral bone. Sharp borders between tumor and bone are indicative of a slow-growing neoplasm. World J Surg Oncol. 2004; 2: 38.