Chondroblastoma also known as Codman tumor, calcifying giant cell tumor or epiphyseal chondromatous giant cell tumor is a rare tumor occurring in young patients. It commonly arises in the epiphyseal region of long bones and usually involves a single bone. Although a majority of them are benign, few can become malignant and even metastasize.
Chondroblastomas occur predominantly in the second and third decade of life and their incidence is higher amongst males . They account for <1% of all primary bone tumors  and arise from the secondary ossification centers  at the epiphyseal ends of long bones like the distal and proximal femur, proximal tibia, and proximal humerus  . They can also be found in flat bones like the acetabulum and ilium, or other sites such as the talus, calcaneus, patella , and the temporal bone .
Characteristic clinical presentation of chondroblastomas is often vague joint pain or localized tenderness, without a history of trauma. A palpable mass, joint effusion, muscle atrophy and decreased range of joint motion may also be present. Constitutional symptoms are usually absent. Fractures are rare but may occur when the tumor is large. Recurrence rates of chondroblastoma have been reported to be higher when they have a component of aneurysmal bone cyst . Chondroblastomas can be localized or can extend into the surrounding soft tissues. Some chondroblastomas behave aggressively and can recur following excision or metastasize to distant organs, especially the lungs. Deaths following widespread metastasis of chondroblastoma have been reported   .
Entire Body System
Osteoarthritis of the hip joint secondary to femoral head collapse may develop after curettage of lesions in the femoral head. [ncbi.nlm.nih.gov]
A clinical presentation of constitutional symptoms along with a metaphyseodiaphyseal lesion on radiographs in a young child usually points toward a diagnosis of Ewing's sarcoma or infection. [ncbi.nlm.nih.gov]
Constitutional symptoms are usually absent. Fractures are rare but may occur when the tumor is large. Recurrence rates of chondroblastoma have been reported to be higher when they have a component of aneurysmal bone cyst. [symptoma.com]
A rare case of metaphyseodiaphyseal chondroblastoma of proximal femur presenting with constitutional symptoms in a six-year-old child. Journal of Pediatric Orthopaedics B. 2012;21(2):174-8. [pubs.sciepub.com]
Jaw & Teeth
We present the case of a 15-year-old patient with right hip pain which was first attributed to adductor tendinitis. [ncbi.nlm.nih.gov]
Diwanji SR, Cho SG, Kong IK, Yoon TR: Hip pain in a 24-year-old woman. Clin Orthop 461:262-8,2007. Dwaik M, Devlin PB: Case report: metadiaphyseal chondroblastoma. Clin Radiol 45:131-3,1992. [orthopaedicsone.com]
swelling with no aural symptoms. [neurologyindia.com]
The workup of chondroblastoma relies mainly on radiology and histopathology. On plain X-rays, chondroblastomas appear as circumscribed radiolucent lesions, with sclerotic rims and smooth or lobulated margins located eccentrically within the epiphysis of long bones, typically the humerus, femur or the tibia. Approximately 50% of the tumors have internal calcifications  . A variable amount of joint effusion is noticed in about 30% of patients . Computed tomograms (CT) are preferred to plain X-rays as they can demonstrate more accurately the relationship of the tumor to the epiphyseal and articular region, the extension of the tumor to the cortex, as well as the periosteal reaction, and the internal calcification  . CT scan can also reveal endosteal scalloping .
Magnetic resonance imaging (MRI) is performed to detect transphyseal or transcortical extension, the status of the bone marrow and the extent of the soft tissue edema  .
On histopathology, the characteristic finding in a chondroblastoma is the chicken wire pattern of linear deposition of calcification around individual chondroblasts  . The reaction of neoplastic cells to S-100 protein and vimentin can be demonstrated with immunohistochemical staining.
Differential diagnosis of chondroblastoma include other bone tumors like giant cell tumor, clear cell chondrosarcoma, chondromyxoid fibroma, eosinophilic granuloma, and chondroblastoma-like chondroma and these have to excluded on the basis of their radiological and histological characteristics.
Treatment consisted of aggressive curettage, phenolization, and bone allograft. The patient was able to resume normal activities after treatment, and there was no recurrence of the chondroblastoma during a follow-up of 3 years. [ncbi.nlm.nih.gov]
Thus, except for the distinctive site of the long bone diaphysis, which made diagnosis difficult, the patients' ages, symptoms, X-ray and CT images, treatment, and prognosis were in accordance with typical lesions in the epiphysis and metaphysis. [ncbi.nlm.nih.gov]
Although most of them are benign, the prognosis is not predictable. A 14-year-old girl presented with recurrent slowly growing mass over the right side of the temporo-parietal region of skull vault. [najms.org]
[…] recurrence (up to 1/3) Most common locations for recurrence to occur are proximal femur and pelvis Pathologic fractures Very rare Malignant transformation Extremely rare Pulmonary metastases or local invasion are possible, even with “benign” tumors Prognosis [learningradiology.com]
[…] this highly lauded three-volume reference provides an interdisciplinary approach to the diagnosis, treatment, and management of head and neck diseases, including the incidence, etiology, clinical presentation, pathology, differential diagnosis, and prognosis [books.google.it]
We discuss the diagnostic considerations and possible etiology of chondroblastoma given this unusual location. [ncbi.nlm.nih.gov]
Updated, reorganized, and revised throughout, this highly lauded three-volume reference provides an interdisciplinary approach to the diagnosis, treatment, and management of head and neck diseases, including the incidence, etiology, clinical presentation [books.google.it]
The distal femoral and proximal tibial epiphyses are most frequently involved, followed by the proximal humerus, where approximately 18% of chondroblastomas appear.  Etiology No risk factors are known for chondroblastoma. [emedicine.com]
Updated Molecular and Epidemiologic diagrams added to all new chapters. [books.google.it]
This study was designed to review the epidemiologic characteristics and outcomes of surgical management in a large series of patients with extremity chondroblastoma. [ncbi.nlm.nih.gov]
Epidemiology: Chondroblastomas typically occur in adolescents and young adults. According to the largest studies, the average age is 22 years old (Ramappa, 2000). [posna.org]
[…] patients with chondroblastoma.  Sjögren et al performed cytogenetic analysis of benign and malignant cartilage tumors, and while they observed no consistent karyotypic abnormalities, there were recurrent breakpoints seen at 2q35, 3q21-23, and 18q21.  Epidemiology [emedicine.com]
Figures 1, 2 and 3: Typical radiological findings of a lytic eccentric lesion affecting the epyphysis of the humerus (1 RX, 2 NMR and 3 bone scan) Epidemiology Chondroblastoma is a rare neoplasm accounting for less than 1% of all bone tumors. [atlasgeneticsoncology.org]
Pathophysiology Various theories have been proposed concerning the pathogenesis of chondroblastomas. [emedicine.com]
We report the case of a patient with chondroblastoma of the femoral head who was treated with wide curettage of the lesion and implantation of an osteochondral allograft to prevent femoral head collapse. [ncbi.nlm.nih.gov]
Treatment & Care Options Neurosurgery, aimed at removing the tumor and preventing damage to the end of the affected bone, is standard treatment for chondroblastoma. [danafarberbostonchildrens.org]
The goal for treatment of chondroblastoma is to remove the tumor and prevent damage to the end of the affected bone. Treatment may include: Surgical removal of the tumor Bone grafting. [hopkinsmedicine.org]
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