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Bizarre parosteal osteochondromatous proliferation was first described in 1983, when Nora et al. reported 35 examples of a proliferative lesion involving the small bones of the hands and, less often, the feet. No examples involving the large bones were reported. We present 65 cases of this condition, five from the Mayo Clinic files and 60 from our(More)
A series of 111 mesenchymal chondrosarcomas was reviewed. The ages of the patients ranged from 5 to 74 years, and approximately 60% of them were in the second and third decades of life. There was no significant sex predilection. Seventy-two tumors, including 5 that involved multiple skeletal sites, arose in bone. Thirty-eight tumors were found in(More)
To describe the radiographic features of clear cell chondrosarcoma (CCCS), including the computed tomographic (CT) and magnetic resonance (MR) findings, and to correlate them with the histopathologic findings. A retrospective review was carried out of 72 patients with histopathologically confirmed CCCS. Imaging studies were available for 34 patients:(More)
Based on study of 58 histologically proved cases of SMCD, we believe that the prognosis of most SMCD patients can be anticipated at the time of initial diagnosis by using 5 independent significant predictors developed in a multivariate model. Our study confirms the significance of several previously reported poor prognostic factors: absence of skin(More)
A clinical and hematopathologic review of 66 patients with systemic mast cell disease (SMCD) was undertaken to investigate the frequency and the clinical significance of associated hematologic disorders. Twenty-two patients were found to have a second hematologic disorder, 19 of which involved the myeloid cells (ten dysmyelopoietic syndromes, five(More)
Giant cell reactions (giant cell reparative granulomas) are uncommon lesions that predominantly involve the small bones of the hands and feet. In 1980, only 13 cases of this entity had been described. Three patients with similar giant cell reactions were identified from the Mayo Clinic files, and an additional 27 patients were collected from the(More)
BACKGROUND High grade surface osteosarcoma is a rare subtype of osteosarcoma arising on the surface of bone, accounting for only 8.9% of surface osteosarcomas at the study institution. METHODS This study reviews 46 cases of high grade surface osteosarcoma, comprised of 13 cases from the Mayo Clinic files and 33 from the authors' files. Histologic features(More)