Extraosseous Osteosarcoma, also known as extraskeletal osteosarcoma, is related to parosteal osteosarcoma and osteogenic sarcoma, and has symptoms including pain An important gene associated with Extraosseous Osteosarcoma is CD99 (CD99 Molecule (Xg Blood Group)), and among its related pathways/superpathways are Pleural mesothelioma and Hematopoietic Stem Cells and Lineage-specific Markers. The drugs Mechlorethamine and Ifosfamide have been mentioned in the context of this disorder. Affiliated tissues include bone and salivary gland, and related phenotypes are Increased shRNA abundance (Z-score > 2) and immune system