Tumor Classification
Osseous Producing Tumors
Benign Osseous
Osteoblastoma
General Information Benign osteoblastic neoplasm with aggressive growth pattern (considered a benign aggressive tumor) Histologically it is similar to osteoid osteoma but is a larger size and grows progressively Consists of well vascularized connective tissue stroma...
Osteoid Osteoma
General Information Osteoid Osteoma is a benign osteoblastic (bone forming) tumor that is usually less than 2cm in size. It consists of a central vascularized nidus that represents the neoplastic tissue. The nidus is surrounded by normal reactive bone. It is usually a...
Osteoma
GENERAL INFORMATION Osteoma is a rare benign bone tumor, composed of mature osseous tissue. It presents as a protruding mass of dense periosteal intramembranous bone, usually on surface of host bone. It is abnormally dense but is normal bone formed in the...
Malignant Osseous Osteosarcoma
Intramedullary Types
Conventional OS (Most Common)
Telangiectatic OS
Low Grade Intraosseous OS
Intracortical OS
Cartilage Producing Tumors
Benign Chondroid
Enchondroma
General Information Enchondroma is a benign indolent intramedullary hyaline cartilage neoplasm Accounts for 10% of all benign osseous tumors Limited growth, most lesions are less than 5 cm in maximal dimension Bones grow from a cartilaginous growth plate that...
Periosteal Chondroma
General Information Benign neoplasm Composed of mature hyaline cartilage Arises from surface of bone from inner layer of periosteum Erodes the outer table of the cortex Does not grossly extend into medullary cavity Also known as juxtacortical chondroma More cellular...
Osteochondroma
General Information Osteochondroma is an outgrowth of medullary and cortical bone A portion of the cartilaginous growth plate grows outward instead of longitudinally and forms the osteochondroma/exostosis (like a branch on a tree) It consists of bone covered with...
Chondroblastoma
General Information Codman Tumor (old historical name for chondroblastoma) Cartilage Containing Giant Cell Tumor (Kolodney 1972) Calcifying Giant Cell Tumor (Ewing 1928) Clinical Data Rare; 1-2% all bone tumors Male predilection (2:1) Children and young adults; 90%...
Chondromyxofibroma (CMF)
General Information Dedifferentiated chondrosarcoma consists of a low grade malignant hyaline cartilage tumor associated with a high-grade nonchondroid spindle sarcoma. The two components are juxtaposed with abrupt clear demarcation line The high grade sarcoma is most...
Malignant Chondroid Chondrosarcoma
Intramedullary
Conventional CS
Grade 1, 2, and 3
Clear Cell CS
Mesenchymal CS
Dedifferentiated CS
Juxtacortical/Surface
Periosteal CS
Secondary CS
Osteochondroma
Enchondroma
MHE
Enchondromatosis