Giant abdominal osteosarcoma causing intestinal obstruction treated with resection and adjuvant chemotherapy

Figure 1 A giant heterogeneous, partially hyper dense soft tissue mass containing cystic spaces located in the right abdomen.

Figure 2 Intra-operative findings: A 22 cm × 12 cm × 10 cm mass occupying the right abdomen in close proximity with the cecum, the right kidney and the urinary bladder (A and B).

Figure 3 The tumor. A: The tumor consisted of atypical spindle or polyhedral cells that were intimately associated to neoplastic bone deposited in a lacy pattern (haematoxylin and eosin stain, original magnification × 20); B: The tumor cells were mitotically active and frequently demonstrated atypical mitotic figures (haematoxylin and eosin stain, original magnification × 40).