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Wednesday, September 08 2010 @ 06:55 AM CDT

Bone and Cartilage
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Ossifying fibroma, also known as osteofibrous dysplasia, is a benign fibrous tumor with local aggressive behavior. The most common site in adults is the mandible. The most common site in children is the tibia, followed by other long bone
Osteofibrous Dysplasia
Saturday, August 02 2008 @ 05:11 PM CDT
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Adamantinoma of the long bones, or extragnathic adamantinoma, is an extremely rare, low-grade malignant tumor of epithelial origin. It is not related to adamantinoma or ameloblastoma of the mandible and maxilla which is derived from Rath
Adamantinoma
Saturday, August 02 2008 @ 05:11 PM CDT
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Aneurysmal bone cyst (ABC) is a solitary, expansile and erosive lesion of bone. It is found most commonly during the second decade and the ratio of female to male is 2:1. ABC's can be found in any bone in the body. The m
Aneurysmal Bone Cyst
Saturday, August 02 2008 @ 05:11 PM CDT
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Osteoma is a benign bony outgrowth of membranous bones. They are found mostly on skull and facial bones.There are two types of osteomas microscopically. Compact or "ivory" osteomas are made of mature lamellar bone. They have no Haversian canals and no fib
Osteoma
Saturday, August 02 2008 @ 05:11 PM CDT
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OS is the most frequent type of bone tumour and is most common between the ages of 15 to 25. Over 90% of tumours are located in the metaphysis (the growing ends of the bone), the most common sites are the bones around the knee which account for 80% of cas
Osteosarcoma
Saturday, August 02 2008 @ 05:11 PM CDT
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synovial chondromatosis appears as focal islands of disorganized hyaline cartilage metaplasia in synovium. This condition has aggressive cytologic features including enlarged chondrocytes, hypercellularity and pleomorphic nuclei but is a benign, self limi
Synovial Chondromatosis
Saturday, August 02 2008 @ 05:11 PM CDT
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The extraskeletal myxoid chondrosarcoma usually affects the deep tissues of the extremities with the thigh being the most common site. Most patient are between the 4th and 5th decade. The lesion is slow growing and may be associated with pain and tenderness. It arises within the muscles or in less than 20% in the subcutis. It is well circumscribed usually about 10cm when discovered, and has a fibrous pseudocapsule. It may be hemorrhagic. Histology: Multinodular, with abundant myxoid matrix. Tumor cells are in chords or in clusters with eosinophilic cytoplasm, and hyperchromatic nuclei. Mitoses are low. Immunohistochemistry: CD57+, EMA+, GAFP -, S-100 weak.
Extraskeletal Myxoid Chondrosarcoma
Saturday, August 02 2008 @ 05:11 PM CDT
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Chordoma is a rare malignant tumor that arises from notochord remnants. Chordomas account for 1 to 4% of all bone tumors.Under the microscope, the chordomas are characterized by lobules and fibrous septa. The malignant cell has eosinophilic cytoplasm. Pro
Chordoma
Saturday, August 02 2008 @ 05:11 PM CDT
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Histologically, the lesion contains very cellular cartilage, a proliferation of bizarre fibroblasts, and disorganized bone with spindle shaped fibroblasts in the intertrabecular spaces, leading to confusion with chondrosarcoma, fibrosarcoma, low grade par
Bizarre Parosteal Osteochondromatous Proliferation (Nora's Lesion)
Saturday, August 02 2008 @ 05:11 PM CDT
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Clear cell chondrosarcoma is a subtype of chondrosarcoma that often occurs in the epiphysis, which has lead to speculation that the lesion is somehow related to chondroblastoma Variants of Chondrosarcoma Central Peripheral Dedifferentiated Clear ce
Clear Cell Chondrosarcoma
Saturday, August 02 2008 @ 05:11 PM CDT
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Histologically, it is predominantly comprised of small, mostly undifferentiated oval-to-spindle shaped cells. The cartilaginous component is variable, but is usually a minority of the tumor. The cartilage is usually low-grade and well demarcated from the
Mesenchymal chondrosarcoma
Saturday, August 02 2008 @ 05:11 PM CDT
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Chondroblastoma is a rare, benign tumor derived from chondroblasts. It is found in the epiphysis of long bones, usually of the lower extremity. The most common site is the distal femur followed by the proximal femur, proximal humerus and proximal tibia.
Chondroblastoma
Saturday, August 02 2008 @ 05:11 PM CDT
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