The lesion may demonstrate a local aggressive nature and must be differentiated from more ominous lesions such as parosteal osteosarcoma or chondrosarcoma.
A distinct blue tinctorial appearance to the bone may be helpful in distinguishing the lesion from parosteal osteosarcoma (5).
Parosteal osteosarcoma, the favored radiologic diagnosis in our case, only rarely involves the small bones of the hands or feet, where BPOP tends to occur.
Bizarre parosteal osteochondromatous proliferation and periosteal chondroma: a comparative report and review of the literature.
Bizarre parosteal osteochondromatous proliferation (Nora's lesion): a retrospective study of 12 cases, 2 arising in long bones.
Bizarre parosteal osteochondromatous proliferation in the anterior maxilla: report of a case.
Berber O, Dawson-Bowling S, Jalgaonkar A, Miles J, Pollock RC, Skinner JA, Aston WJ, Briggs TW Bizarre parosteal osteochondromatous proliferation of bone: clinical management of a series of 22 cases.
Osteosarcoma can be subdivided into medullary, parosteal, periosteal and telangiectatic, all of which carry different prognoses and treatment options.
Parosteal osteosarcoma (Figure 12) originates from the parosteal soft tissues and is less aggressive than the medullary form.
17) The most frequently reported cytogenetic abnormalities include 1p11-13, 1q21-22, 11p14-15, 14p11-13, 15p11-13, and 19q13, and +1, -10, and -17 (18); however, cytogenetic differences among the various histologic subtypes (conventional, telangiectatic, smallcell, giant cell, parosteal
, and others) have not been systematically explored.
Grade 1 (Low Grade) Low-grade central osteosarcoma Parosteal
osteosarcoma Adamantinoma Grade 2 Periosteal osteosarcoma Grade 3 (High Grade) Ewing sarcoma/PNET Conventional osteosarcoma Telangiectatic osteosarcoma Mesenchymal chondrosarcoma Small cell osteosarcoma Secondary osteosarcoma High-grade surface osteosarcoma Dedifferentiated chondrosarcoma Dedifferentiated chordoma Malignant giant cell tumor