Benign Bone-Forming Tumors 1 Bone Island/Osteopoikilosis 2 Osteoma 3 Osteoid Osteoma 4 Osteoblastoma Malignant Bone-Forming Tumors 5 Conventional Osteosarcoma 6 Well-Differentiated Intramedullary Osteosarcoma 7 Parosteal Osteosarcoma 8 Periosteal Osteosarcoma 9 High-Grade Surface Osteosarcoma 10 Secondary Osteosarcoma Benign Cartilage Tumors 11 Vascular Cartilaginous Hamartoma of Chest Wall 12 Osteochondroma 13 Multiple Hereditary Osteochondromatosis 14 Enchondroma 15 Enchondromatosis 16 Periosteal Chondroma 17 Chondroblastoma 18 Chondromyxoid Fibroma Malignant Cartilage Tumors 19 Conventional Chondrosarcoma 20 Dedifferentiated Chondrosarcoma 21 Clear Cell Chondrosarcoma 22 Mesenchymal Chondrosarcoma Fibrous and Fibrohistiocytic Tumors 23 Fibrous Cortical Defect/Nonossifying Fibroma 24 Desmoplastic Fibroma 25 Myofibroma and Myofibromatosis 26 Fibrosarcoma (Malignant Fibrous Histiocytoma) Fibroosseous Tumors 27 Fibrous Dysplasia 28 Liposclerosing Fibromyxoid Tumor 29 Osteofibrous Dysplasia 30 Adamantinoma Malignant Small Round Cell Tumors 31 Ewing Sarcoma/Primitive Neuroectodermal Tumor (PNET) 32 Melanotic Neuroectodermal Tumor Notochordal Tumors 33 Ecchordosis 34 Benign Notochordal Cell Tumor 35 Chordoma Giant Cell-Rich Tumors 36 Giant Cell Tumor 37 Brown Tumor 38 Giant Cell Reparative Granuloma Cystic Lesions of Bone 39 Intraosseous Ganglion 40 Unicameral Bone Cyst 41 Aneurysmal Bone Cyst 42 Epidermoid Inclusion Cyst Vascular Tumors 43 Conventional Hemangioma 44 Lymphangioma/Lymphangiomatosis 45 Epithelioid Hemangioma 46 Epithelioid Hemangioendothelioma 47 Angiosarcoma Hematopoietic Tumors 48 Langerhans Cell Histiocytosis (Eosinophilic Granuloma) 49 Primary Lymphoma 50 Plasmacytoma/Myeloma 51 Mast Cell Disease 52 Erdheim-Chester Disease 53 Rosai-Dorfman Disease 54 Benign Fibrous Histiocytoma Miscellaneous Mesenchymal Tumors 55 Adipocytic Tumors 56 Leiomyosarcoma 57 Myoepithelioma 58 Solitary Fibrous Tumor/Hemangiopericytoma 59 Schwannoma 60 Myxopapillary Ependymoma Metastatic Tumor of Skeleton 61 Metastatic Tumors Bone Tumor Mimics 62 Bizarre Parosteal Osteochondromatous Proliferation and Related Lesions 63 Melorheostosis 64 Amyloidoma 65 Gaucher Disease 66 Phosphaturic Mesenchymal Tumor Antibody Index 67 Protocol for Examination of Bone Tumor Specimens