Chondroblastomas, also referred as Codman tumors, are rare benign cartilaginous neoplasms that characteristically arise in the epiphysis or apophysis of a long bone in young patients. Despite being rare, they are one of the most frequently encountered benign epiphyseal neoplasms in skeletally immature patients.
Chondroblastomas represent less than 1% of all primary bone tumors, occurring predominantly in young patients (<20 years of age) with an overall male predilection 7.
Clinical presentation is non-specific and may include joint pain, muscle wasting, tenderness, and swelling/local mass.
Malignant transformation has been seen in a small proportion of cases, with local and vascular invasion, and distant metastases.
Aneurysmal bone cysts can be seen secondarily to underlying chondroblastoma 13.
Microscopically they are composed of chondroblasts, chondroid matrix, cartilage with occasional giant multinucleated cells (which may lead to the incorrect diagnosis of giant cell tumor).
Calcium deposition surrounding the chondroblasts, which are typically polyhedral shape, results in typical "chicken-wire calcification" (pathognomonic) 7,10.
Chondroblastomas most frequently arise in the epiphyses of long bones, with 70% occurring in the humerus (most frequent), femur and tibia 9. Approximately 10% are found in the hands and feet 7.
Chondroblastomas are seen as well defined lucent lesions, with either smooth or lobulated margins and a thin sclerotic rim, arising eccentrically in the epiphysis of long tubular bone such as the femur, humerus, or tibia or apophysis such as greater trochanter, greater tuberosity, calcaneus or talus. Internal calcifications can be seen in 40-60% of cases 7,9. A joint effusion is seen in one-third of patients. They range in size from 1-10 cm, with most being 3-4 cm at diagnosis 10.
CT demonstrates the plain film findings with better delineation of the relationship to the growth plate and articular surface. Solid periosteal reaction (seen in up to 50% of cases) and internal calcification (calcified matrix seen in ~50% of cases) and cortical breach are also more easily appreciated 7,8. Endosteal scalloping may be seen 10.
MRI is ideal for the evaluation of transphyseal or transcortical extension, and for demonstrating associated surrounding bone marrow and soft tissue edema, which is seen in a large proportion of cases 5,7.
These lesions have signal typical of cartilage:
- T1: lesion itself is of low to intermediate signal
- T2/STIR: lesion is of intermediate to high signal
Fluid-fluid levels may occasionally be seen (see fluid-fluid level containing bone lesions) presumably due to an associated aneurysmal bone cyst 4.
Treatment and prognosis
Treatment typically consists of curettage and packing of the resulting cavity with either bone or bone cement (polymethylmethacrylate). Radiofrequency ablation has also been used 7.
Unfortunately due to their proximity to the articular surface and growth plate complete eradication is difficult. As a result recurrence rates are relatively high (8-20%), and injury to the growth plate may result in growth arrest and limb-length discrepancy 7.
Complications associated with chondroblastomas include pathological fractures and rarely, malignant transformation and pulmonary metastasis 6.
History and etymology
In 1931, this lesion was described by Ernest Armory Codman (1869-1940), American physician, as an epiphyseal chondromatous giant cell tumor of the proximal humerus, hence the term Codman tumor 11.
In 1942, Henry L Jaffe (1896-1979) and Louis Lichtenstein (1906-1977), American physicians and pathologists, designated this tumor as a benign chondroblastoma of bone 12.
The differential is that of other lesions which have a predilection for the epiphysis or apophysis (see differential for an epiphyseal lesion). Specific lesions to be considered include 10:
- clear cell chondrosarcoma: see chondroblastoma vs clear cell chondrosarcoma
- osteomyelitis with abscess, e.g. Brodie abscess
- intraosseous ganglion
- giant cell tumor: older age group (closed physis)
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- 11. Codman EA. The Classic: Epiphyseal chondromatous giant cell tumors of the upper end of the humerus. Surg Gynecol Obstet.1931;52:543. Clin. Orthop. Relat. Res. 2006;450: 12-6. doi:10.1097/01.blo.0000229309.90265.df - Pubmed citation
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- 13. Sepah YJ, Umer M, Minhas K, Hafeez K. Chondroblastoma of the cuboid with an associated aneurysmal bone cyst: a case report. (2007) Journal of Medical Case Reports. 1 (1): 135. doi:10.1186/1752-1947-1-135 - Pubmed
Related Radiopaedia articles
The differential diagnosis for bone tumors is dependent on the age of the patient, with a very different set of differentials for the pediatric patient.
- bone-forming tumors
- cartilage-forming tumors
- chondromyxoid fibroma
- juxtacortical chondroma
- fibrous bone lesions
- bone marrow tumors
- other bone tumors or tumor-like lesions
- aneurysmal bone cyst
- benign fibrous histiocytoma
- giant cell tumor of bone
- Gorham massive osteolysis
- haemophilic pseudotumor
- intradiploic epidermoid cyst
- intraosseous lipoma
- musculoskeletal angiosarcoma
- musculoskeletal hemangiopericytoma
- primary intraosseous hemangioma
- post-traumatic cystic bone lesion
- simple bone cyst
- impending fracture risk