Cases reported "Osteoblastoma"

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1/3. osteoblastoma of the mandible: clinicopathologic study of four cases and literature review.

    BACKGROUND: osteoblastoma is a benign bone tumor accounting for 1% of all bone tumors; it commonly involves the spine and the sacrum of young individuals, with less than 5% being localized to the posterior mandible. In view of its rarity in the maxilla and mandible, osteoblastoma is rarely diagnosed as such in the absence of interdisciplinary cooperation. methods: A retrospective study of four benign osteoblastomas was performed based on a review of the clinical, radiographic, and histopathologic features of all cases. RESULTS: The tumors involved the posterior mandible of young patients (age range, 10-21 years; two male and two female patients) and appeared as painful bone expansions. Radiologically, they were poorly defined, radiolucent/radiopaque lesions containing calcifications and not showing sclerotic borders or periosteal reactions. Histologically, they were composed of osteoid and woven bone surrounded by plump osteoblast-like cells with interposed fibroblasts, inflammatory cells, and red blood cells. All patients were disease free after prolonged follow-up. CONCLUSIONS: Osteoblastomas may be distinguished from other bone tumors, fibro-osseous lesions, and odontogenic neoplasms on the basis of integrated clinical, radiologic, and histologic features and usually manifest an indolent clinical course.
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2/3. Sacral osteoblastoma presenting as a L5-S1 disc herniation.

    osteoblastoma is an uncommon neoplasm of the bone accounting for only 0.5-2% of all primary bone tumors. It constitutes 9% of all primary bone tumors arising in the sacrum. The symptoms have a wide spectrum of variety and the diagnosis is often delayed. We report a case of sacral osteoblastoma in a 20-year-old man who presented with classical symptoms of postero-lateral herniation of L5-S1 vertebral disc. The clinical and radiographic findings are discussed as well as the surgical treatment.
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3/3. MR imaging of a malignant schwannoma and an osteoblastoma with fluid-fluid levels. Report of two new cases.

    One case of malignant schwannoma of the sacrum and another of occipital osteoblastoma were evaluated by MR imaging. Both tumors showed fluid-fluid levels with different signal intensities in the sequences performed. Pathologic examination revealed hemorrhagic fluid in both tumors. Malignant schwannoma and osteoblastoma should be included in the list of bone and soft-tissue with fluid-fluid levels. Our data confirm the non-specificity of this finding, which only suggests the presence of previous intratumoral hemorrhage.
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