Chondroblastoma: A usually benign tumor composed of cells which arise from chondroblasts or their precursors and which tend to differentiate into cartilage cells. It occurs primarily in the epiphyses of adolescents. It is relatively rare and represents less than 2% of all primary bone tumors. The peak incidence is in the second decade of life; it is about twice as common in males as in females. (From Dorland, 27th ed; Holland et al., Cancer Medicine, 3d ed, p1846)Curettage: A scraping, usually of the interior of a cavity or tract, for removal of new growth or other abnormal tissue, or to obtain material for tissue diagnosis. It is performed with a curet (curette), a spoon-shaped instrument designed for that purpose. (From Stedman, 25th ed & Dorland, 27th ed)Foot Bones: The TARSAL BONES; METATARSAL BONES; and PHALANGES OF TOES. The tarsal bones consists of seven bones: CALCANEUS; TALUS; cuboid; navicular; internal; middle; and external cuneiform bones. The five metatarsal bones are numbered one through five, running medial to lateral. There are 14 phalanges in each foot, the great toe has two while the other toes have three each.Bone Cysts, Aneurysmal: Fibrous blood-filled cyst in the bone. Although benign it can be destructive causing deformity and fractures.Temporal Bone: Either of a pair of compound bones forming the lateral (left and right) surfaces and base of the skull which contains the organs of hearing. It is a large bone formed by the fusion of parts: the squamous (the flattened anterior-superior part), the tympanic (the curved anterior-inferior part), the mastoid (the irregular posterior portion), and the petrous (the part at the base of the skull).Bone Neoplasms: Tumors or cancer located in bone tissue or specific BONES.Femoral NeoplasmsTarsal Bones: The seven bones which form the tarsus - namely, CALCANEUS; TALUS; cuboid, navicular, and the internal, middle, and external cuneiforms.Skull Neoplasms: Neoplasms of the bony part of the skull.Humerus: Bone in humans and primates extending from the SHOULDER JOINT to the ELBOW JOINT.Giant Cell Tumor of Bone: A bone tumor composed of cellular spindle-cell stroma containing scattered multinucleated giant cells resembling osteoclasts. The tumors range from benign to frankly malignant lesions. The tumor occurs most frequently in an end of a long tubular bone in young adults. (From Dorland, 27th ed; Stedman, 25th ed)Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Shoulder Fractures: Fractures of the proximal humerus, including the head, anatomic and surgical necks, and tuberosities.Bone Cysts: Benign unilocular lytic areas in the proximal end of a long bone with well defined and narrow endosteal margins. The cysts contain fluid and the cyst walls may contain some giant cells. Bone cysts usually occur in males between the ages 3-15 years.Arthrodesis: The surgical fixation of a joint by a procedure designed to accomplish fusion of the joint surfaces by promoting the proliferation of bone cells. (Dorland, 28th ed)Ilizarov Technique: A bone fixation technique using an external fixator (FIXATORS, EXTERNAL) for lengthening limbs, correcting pseudarthroses and other deformities, and assisting the healing of otherwise hopeless traumatic or pathological fractures and infections, such as chronic osteomyelitis. The method was devised by the Russian orthopedic surgeon Gavriil Abramovich Ilizarov (1921-1992). (From Bull Hosp Jt Dis 1992 Summer;52(1):1)ArchivesBiological Science Disciplines: All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.Periodicals as Topic: A publication issued at stated, more or less regular, intervals.PubMed: A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.Gastroenterology: A subspecialty of internal medicine concerned with the study of the physiology and diseases of the digestive system and related structures (esophagus, liver, gallbladder, and pancreas).Germany

Chondroblastoma of the temporal bone: a clinicopathologic study of five cases. (1/41)

Chondroblastoma is a rare benign bone tumor. It commonly affects the epiphysis of long bones during the second and third decades of life. Chondroblastoma of the temporal bone is extremely rare. We reviewed five cases of chondroblastoma arising in the temporal bone. Four cases were female and one was male. The ages ranged from 41 to 60 years (mean, 53.6 years). All cases involved the temporal bone. Three involved the left side and two the right. Chief complaints were long-standing localized pain and hearing difficulty. A sharply demarcated lobulated mass was the main radiological finding. Microscopic findings were those of chondroblastoma of usual locations. Two cases showed aneurysmal bone cyst-like areas. Immunohistochemical studies for CD34, CD99, S-100 protein and cytokeratin were performed. Tumor cells were diffusely positive for S-100 protein in three cases and weakly positive for cytokeratin in one case. CD34 and CD99 were negative in all cases. In summary, chondroblastoma of the temporal bone is rare and occurs in older age group than reported cases of chondroblastoma of the usual location in the literature.  (+info)

Extendible replacements of the proximal tibia for bone tumours. (2/41)

Limb salvage is now customary in the treatment of primary bone tumours. The proximal tibia is a frequent site for these neoplasms but reconstruction, especially in children, is a formidable challenge. We reviewed 20 children with extendible replacements of the proximal tibia, all with a minimum follow-up of five years. Five died from their disease and, of the remaining 15, four had above-knee amputations for complications. Infection occurred in seven patients; in five it was related to the lengthening procedure. Aseptic loosening is inevitable in the younger children and only two have avoided a revision, amputation or other major complication; both were aged 12 years at the time of the initial surgery. Despite this, 11 children are alive with a functioning leg and a mean Musculoskeletal Tumour Society functional score of 83%. The lengthening mechanisms used in our series required extensive open operations. We are now using a simpler, minimally invasive, technique which we hope will decrease the incidence of complications. At present, the use of extendible prostheses of the proximal tibia remains an experimental procedure.  (+info)

h-Caldesmon as a specific marker for smooth muscle tumors. Comparison with other smooth muscle markers in bone tumors. (3/41)

Caldesmon is a protein widely distributed in smooth and non-smooth muscle cells and is thought to regulate cellular contraction. Its isoform, high-molecular-weight caldesmon (h-CD), was demonstrated to be specific for smooth muscle cells and smooth muscle tumors of the soft tissue and to never be expressed in myofibroblasts. We performed an immunohistochemical study to examine h-CD expression in the following bone tumors: conventional and non-conventional osteosarcoma, 13; malignant fibrous histiocytoma of bone, 5; giant cell tumors of bone, 5; chondroblastoma, 3; metastatic leiomyosarcoma, 2; and rhabdomyosarcoma, 1. Frequent immunoreactivity for muscle actin (alpha-smooth muscle actin or muscle-specific actin) was seen in 11 of 13 osteosarcomas and all other tumors, whereas h-CD was expressed intensely only in 2 leiomyosarcomas. h-CD is considered a specific and useful marker to distinguish smooth muscle tumor from bone tumors with myoid differentiation.  (+info)

Benign chondroblastoma of bone. Report of a case. (4/41)

A benign chondroblastoma of bone is reported. It was unusual because it occurred in an old lady, in a toe, and it was not painful and radiologically resembled a chondroma. The coarsely lobulated tumour showed a varied microscopic appearance, but it consisted chiefly of closely packed sheets of small, round polygonal or fusiform cells. There was some calcification present. The literature is reviewed.  (+info)

Chondroblastoma of a metacarpal bone mimicking an aneurysmal bone cyst: a case report and a review of the literature. (5/41)

Chondroblastoma of the metacarpal bone has been extremely rare and only seven cases have been reported in the English literature. Here we reported the eighth case of a chondroblastoma that developed on the first metacarpal bone of the right hand of a 21-year-old man. Radiographs showed an expansile osteolytic lesion with a multilocular appearance. In MR images, the lesion showed low intensity in T1 and high intensity in T2-weighted images with multiple fluid-fluid levels, which are findings resembling those of an aneurysmal bone cyst. From the pathological findings, however, it was recognized as a chondroblastoma with aneurysmal bone cyst-like change. Good clinical results was obtained by the subtotal resection of the metacarpal bone with a columnar-shaped iliac bone graft.  (+info)

Coexisting chondroblastoma and osteochondroma: a case report. (6/41)

The coexistence of two different types of benign cartilaginous tumours of bone in the same patient has not been reported in literature. We report a case in which a sixteen-year-old male had a benign chondroblastoma of the proximal left humerus and an osteochondroma of the distal left femur. Both originated at the same time and had a progressive increase in size with growth.  (+info)

Chondroblastoma of the temporal base with high mitotic activity. (7/41)

A 24-year-old man presented with a rare chondroblastoma of the temporal base manifesting as local pain accompanied by difficulty in opening the mouth. Gross total removal was achieved at initial surgery, but the tumor demonstrated rapid and destructive regrowth from a very small residual volume without definite histological malignant transformation. Growth activity estimated by MIB-1 staining increased spontaneously from 2.5% at the initial operation to 18.7% at recurrence. Further extensive radical tumor removal by surgeons from multiple disciplines was performed. The patient has been free of recurrence for 3 years without radiotherapy. Chondroblastoma of the temporal bone is widely accepted as a benign tumor and regrowth after gross total removal is very rare. However, some cases of chondroblastoma have potentially high mitotic activity.  (+info)

Skull base chondroblastoma: a case report. (8/41)

Chondroblastoma is a rare tumor of the skull. Temporal bone is the commonest site of involvement in the skull. We present a thirty one year old man who presented with painless swelling over the left temporal bone, which was near totally excised after preoperative embolization. Management of this unusual tumor and its complications are discussed.  (+info)

  • Chondroblastoma most often affects the ends of the long bones, near the growth plate, in the arms at the shoulder, and in the legs at the hip and knee. (rochester.edu)
  • Approximately 92% of patients presenting with chondroblastoma are younger than 30 years. (wikipedia.org)
  • Additionally, rare prevalence of chondroblastoma in intra-membranous ossification suggests a close relationship with growth plate cartilage. (wikipedia.org)
  • In chondroblastoma, growth signaling molecules may be present due to the pre-pubertal signaling network as well as cartilage growth. (wikipedia.org)
  • The work of Aigner et al suggests that chondroblastoma should be reclassified as a bone-forming neoplasm versus a cartilaginous neoplasm due to the presence of osteoid matrix, type I collagen, and absence of true cartilage matrix (collagen II). (wikipedia.org)
  • generally, because the bones at the base of the skull develop from cartilage, they have a greater potential for developing chondroblastoma. (medscape.com)
  • Chondroblastoma is very uncommon, accounting for only 1-2% of all bone tumors. (wikipedia.org)
  • The etiology of chondroblastoma is uncertain, as there is no specific characteristic abnormality or chromosomal breaking point observed, despite cytogenetic abnormalities being highly specific for some tumors. (wikipedia.org)
  • Chondroblastoma was first described by Codman in 1928 as "epiphyseal chondromatous giant cell tumors of the proximal humerus" [ 1 ]. (hindawi.com)
  • A Massive Chondroblastoma in the Proximal Humerus Simulating Malignant Bone Tumors," Case Reports in Orthopedics , vol. 2013, Article ID 673576, 5 pages, 2013. (hindawi.com)
  • Chondroblastoma is a rare neoplasm of the bone constituting approximately 1% of all primary bone tumors. (clinmedjournals.org)
  • [ 17 ] On these images, the chondroblastoma may mimic aneurysmal bone cysts, which are also expansile and osteolytic. (medscape.com)
  • It is uncertain why chondroblastoma occurs, but it is sometimes found in conjunction with other growths, such aneurysmal bone cysts , which are found in 20-25 percent of all patients with chondroblastoma. (chop.edu)
  • Aggressive chondroblastoma of the distal tibia is rare, and below-knee amputation had been the standard surgical procedure. (biomedcentral.com)
  • Double pedicel fibular graft and ankle arthrodesis may be an effective and economical alternative method for aggressive chondroblastoma in the distal tibia. (biomedcentral.com)
  • Aggressive chondroblastoma of the distal tibia is further rare. (biomedcentral.com)
  • RFA for chondroblastoma has been described in several reports, but follow-up has been shorter than for surgical treatment, and caution is recommended for cases in which the lesions are larger than 2.5 cm and when there is no subchondral bone support. (medscape.com)
  • Report of the first case of chondroblastoma involving the sinonasal cavity and ventral skull base, offering a description of the puzzling diagnostic process followed by its management. (clinmedjournals.org)
  • The authors report the first case of chondroblastoma ethmoid-spheno-petro-clival associated with epidural abcces that was treated through curretage of the lesion, and drainage of the abccess and antibiotic treatment. (md-medicaldata.com)
  • We describe the main radiologic and histologic characteristics of chondroblastoma and compare them to those of frequently mistaken differential diagnoses. (clinmedjournals.org)
  • On radiographic images, chondroblastoma is characterized by a well-defined osteolytic lesion involving an epiphysis or secondary ossification center (see the following image). (medscape.com)
  • However, Edel et al found that collagen II, a marker for mature chondrocytes, was expressed in chondroblastoma, supporting the chondroid nature of the neoplasm. (wikipedia.org)
  • The results of Romeo and colleagues favor the view of Edel et al of chondroblastoma being cartilaginous in nature but recognize that any definitive determinations regarding the origin of this neoplasm are not possible because of the plasticity of mesenchymal cells when set into different microenvironments and static approaches used in literature. (wikipedia.org)
  • Presence of extensive surrounding reactive edema within the marrow and soft tissues, sclerotic margin, and presence of chondroid matrix are helpful features distinguishing chondroblastoma from GCT. (thefreedictionary.com)