Tumors and Tumorlike Lesions of Bone and Joints by Fritz Schajowicz M.D. (auth.)

By Fritz Schajowicz M.D. (auth.)

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All these cases had a similar histologic aspect, identical to that of the other cases of genuine osteoblastoma, but perifocal bone sclerosis was generally lacking, a thin shell of newly formed periosteal bone covering the lesion. Multifocal Sclerosing Osteoblastoma ("Multifocal Osteoid Osteoma"). This peculiar, relatively rare type of osteoblastoma was described by the writer and Lemos in 1970. The cases described by Tavernier et al. " We have observed two different types, one medullary (central or endosteal) and another peripheral (juxta- Benign a 53 b Fig.

B Male, 6 years old. Upper third of ulna. c Male, 29 years old. Proximal end of metatarsal bone. d Male, 14 years old, innominate bone. ) Benign which the nidus extends into the soft tissue, raising the periosteum. Rarely, there is reactive bone sclerosis of the underlying cortex; a thin layer of periosteal bone may cover it. These cases are difficult if not impossible to differentiate from the periosteal or peripheral type of "osteoblastoma," their separation being arbitrary according to their difference in size.

1971) and in works by Dahlin (1978) and others, osteoma is included in the group of benign bone-forming tumors. Three different types of osteomas may be distinguished: 1) Conventional classic osteoma ("ivory exostosis" ) 2) Juxtacortical (parosteal) osteoma 3) Medullary osteoma (enostosis) Conventional osteoma involves almost exclusively bones of intramembranous (direct) bone formation, preferentially the external table of the skull and the paranasal sinuses, most commonly the frontal and the ethmoid sinuses (Smith and Favaleta 1952; Newell 1948; Vandenberg and Coley 1950; Andrew 1956).

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