Bone: Chondroblastoma

Identity

Phylum	Bone tumors:Cartilage tumors:Chondroblastoma
Note	Chondroblastoma is a benign bone tumour typically affecting the epiphyses of long bones from individuals with an immature skeleton.
	Radiology of Chondroblastoma. FIG. 1,2,3: Typical radiological findings of a lytic eccentric lesion affecting the epyphysis of the humerus (1 RX, 2 NMR and 3 bone scan)

Clinics and Pathology

Epidemiology	Chondroblastoma is a rare neoplasm accounting for less than 1% of all bone tumors. Age of occurrence is usually between 10 and 25 years with a male predominance. Older age of presentation for skull lesions is reported.
Clinics	Usual symptom at presentation is mild localized pain. Radiologically it occurs more often as an eccentric lytic lesion, with sclerotic borders, involving epiphyses of the long bones.
Pathology	The tumour is composed of cellular and matrix rich areas. Cellular areas are made up of so called ³chondroblasts²: round-,or polygonal cells, with an oval to round nucleus and with well defined eosinophilic cytoplasm. Mainly in non-decalcified sections the chondroblasts appear focally delimited by a thin calcification rim, so called ³chicken wire². Matrix rich areas are composed of different types of matrix: chondroid, osteoid, fibrous and rarely mature hyaline cartilage. Mitoses, always typical, are quite frequent, especially in the cellular areas. Immunohistochemical stainings show reactivity of the neoplastic cells for S-100 protein and Vimentin; although several other antigens are reported to be expressed (i.e. Smooth muscle actin and Cytokeratin). Multinucleated giant cells, especially at the periphery of matrix-rich areas, are almost always found. An associated aneurysmal bone cyst occurs in about 1/3 of the cases.
	Histological features of chondroblastoma. Fig.4: The cellular areas are made up of polygonal cells with scattered multinucleated giants cells (Haematoxylin-Eosin stain). Fig.5: The polygonal cells are positive for S-100 immunostain.
Treatment	Simple curettage is the standard treatment.
Evolution	Rate of recurrence is between 14-18% mainly occurring within 2 years, and showing a higher occurrence rate in case of temporal bone location. Rare lung metastases in benign chondroblastomas, are documented. However they are not progressive, and therefore simple observation is sufficient, if necessary followed by simple surgical resection.
Prognosis	The prognosis is good. Rare and doubtful malignant progression are described, but no universal criteria for this event are currently available, and several authors consider this as cases of a misdiagnosis.

Cytogenetics

Cytogenetics Morphological

DNA flow cytometry studies show chondroblastoma mainly to be a low proliferative diploid neoplasm, however aneuploid near-diploid populations have been reported. Karyotypic results of 7 cases are available in the literature. No specific cytogenic abnormalities neither specific type of aberrations are reported sofar. However some chromosomes seem to be more often involved: 3 cases for chromosome 5, 2 for chromosome 8, 2 for chromosome 11 and 2 for chromosome 17.

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Contributor(s)

Written	07-2003	Salvatore Romeo, Pancras CW Hogendoorn
		Leiden University Medical Center, P.O. box 9600, L1-Q, 2300 RC Leiden, The Netherlands

Citation

This paper should be referenced as such :

Romeo S, Hogendoorn PCW . Bone: Chondroblastoma. Atlas Genet Cytogenet Oncol Haematol. July 2003 . URL : http://AtlasGeneticsOncology.org/Tumors/ChondroblastomaID5148.html

This paper is referenced by INIST as such :

http://documents.irevues.inist.fr/bitstream/2042/37999/1/07-2003-ChondroblastomaID5148.pdf   [ Bibliographic record ]

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