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Enchondromas are benign cartilaginous neoplasms that originate in the medullary canal of tubular bones, believed to result from growth of residual benign cartilage rests displaced from the physis. They are often incidental findings, occurring in just under 2% of the population based on autopsy series.
Approximately half of all enchondromas occur in the tubular bones of the hands and feet, with others are found in the metaphyses of other long bones. They rarely occur in the pelvis, shoulder girdle, and axial skeleton.
Diagnostic Radiology/Musculoskeletal Imaging/Tumors Basic/Enchondroma
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http://en.wikibooks.org/wiki/Diagnostic_Radiology/Musculoskeletal_Imag ...
Ewing's sarcoma is a malignant tumor that belongs to a broader family of tumors that includes PNET (primitive neuroectodermal tumors). In simple terms, these tumors are all pathologically characterized by the so-called "small round blue cells." Ewing's sarcoma almost always occurs in bone, although other members of the PNET family can occur anywhere. Ewing's is pathologically differentiated from other members of the family on the basis of immunohistochemical staining.
Ewing's sarcoma was described by James Ewing in 1920. Similar tumors were reported earlier than this, but it was the work of Ewing which established that the disease was separate from lymphoma or neuroblastoma.
Diagnostic Radiology/Musculoskeletal Imaging/Tumors Basic/Ewing sarcoma
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