BACKGROUND To identify the different and identical features of 2 tumors with similar pathologic findings, chondroblastic osteosarcoma (OGS) and chondrosarcoma (CSA), with highlights on radiography and magnetic resonance imaging (MRI). METHODS Ten patients with chondroblastic OGS and 10 patients with CSA were enrolled. After recording the tumor location, tumor morphology was evaluated for patt...

AIMS AND BACKGROUND Information is scarce on systemic treatment of pelvic osteosarcoma because most chemotherapy protocols for osteosarcoma include patients with extremity tumors and aged up to 30-40 years. METHODS Data on patients <41 years of age with high-grade pelvic osteosarcoma were prospectively collected. Patients received two chemotherapy protocols consisting of methotrexate, cisplat...

Periosteal osteosarcoma is an extremely rare chondroblastic osteosarcoma in the flat bone. There were authors reporting of two cases of periosteal osteosarcoma in the highly unusual sites. One of them arose from the rib, in a 17-year-old male, which appeared as a hypodense juxtacortical mass with periosteal reaction on CT. The other one arose from the scapula, in a 17-year-old female, which sho...

Osteosarcoma is relatively rare in the jaws and variable in presentation, thus its recognition may be quite confusing and delay diagnosis and treatment. Also, in contrast to most malignancies, osteosarcoma is usually encountered earlier in life and may clinically resemble features of more common oral entities such as chronic osteomyelitis, fibrous dysplasia, osteoblastic metastatic carcinom...