The neoplasms in this category all produce chondroid matrix, often containing “arcs and rings” of calcifications that can be seen on radiographs and CT. The benign cartilage tumors are typically asymptomatic and represent some of the most commonly encountered incidental bone lesions, with osteochondroma being the most common benign lesion of bone. Osteochondromas demonstrate contiguity of the medullary cavity and cortex with the host bone and pedunculated osteochondromas typically point away from the joint. Enchondromas are very common and are often found in the metaphysis of long bones, hands, and feet. Both enchondromas and osteochondromas can transform into chondrosarcoma and it is important to be familiar with features that suggest malignant transformation. Periosteal chondromas are cartilaginous lesions that arise from the cortical surface and can be difficult to distinguish from periosteal chondrosarcoma or surface osteosarcomas. The smaller size of the periosteal chondroma versus its larger malignant mimickers can be helpful in making the distinction. Chondroblastomas typically occur in skeletally immature patients, arise in the epiphysis, and can have a varied appearance depending on aggressiveness of the lesion. Chondromyxoid fibromas have the least specific imaging features among the benign chondroid lesions. They often do not demonstrate chondroid matrix on imaging, making it difficult to narrow the differential diagnosis. Fortunately, chondromyxoid fibromas are quite rare.
KeywordsGiant Cell Tumor Giant Cell Tumor Aneurysmal Bone Cyst Periosteal Reaction Myositis Ossificans
- 3.Brien EW, Mirra JM, Kerr R. Benign and malignant cartilage tumors of bone and joint: their anatomic and theoretical basis with an emphasis on radiology, pathology and clinical biology. I. The intramedullary cartilage tumors. Skeletal Radiol. 1997;26:325–53.Google Scholar
- 4.Brien EW, Mirra JM, Luck Jr JV. Benign and malignant cartilage tumors of bone and joint: their anatomic and theoretical basis with an emphasis on radiology, pathology and clinical biology. II. Juxtacortical cartilage tumors. Skeletal Radiol. 1999;28:1–20.Google Scholar
- 6.Fletcher CD, Unni KK, Mertens F, editors. WHO classification of tumours: pathology and genetics of tumours of soft tissue and bone. Lyon, France: IARC; 2002.Google Scholar
- 7.Greenspan A, Jundt G, Remagen W. Differential diagnosis in orthopaedic oncology. 2nd ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2007.Google Scholar
- 10.Miller TT, Schweitzer ME. Diagnostic musculoskeletal imaging. New York, NY: McGraw-Hill; 2005.Google Scholar
- 14.Resnick D, editor. Diagnosis of bone and joint disorders. 4th ed. Philadelphia, PA: W.B. Saunders; 2002.Google Scholar