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giant cell tumor of bone

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giant cell tumor of bone
n.
A sometimes malignant osteolytic tumor composed of multinucleated giant cells and ovoid or spindle-shaped cells. It occurs most frequently in an end of a long tubular bone. Also called giant cell myeloma, osteoclastoma.

giant cell tumor of bone.
giant cell tumor of bone
A lesion that comprises 5% of all osseous tumors, which is most common in the weight-bearing epiphysis of ♀ > age 20, which affects the distal femur, proximal tibia, distal radius; 60% recur with curettage; 10% metastasize, an event far more common in deep–to the fascial planes–tumors DiffDx A GCT-like histopathologic lesion may be seen in the brown tumor of hyperparathyroidism, chondroblastoma, giant cell reparative granuloma, benign and malignant fibrous histiocytoma, nonossifying and chondromyxoid fibroma, unicameral bone cyst, aneurysmal bone cyst, fibrous dysplasia, osteoblastoma, osteosarcoma, osteoid osteoma, eosinophilic granuloma


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[4] Giant cell tumor of bone is believed to be of monocytic or histiocytic origin, and the presence of giant cells is attributed to fusion of the mononuclear cells.
Giant cell tumor of bone is rich in RANK Ligand positive cells, which results in giant osteoclasts that destroy the bone locally.
 
 
 
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