title: Intracranial meningioma with abnormal localization of bone-seeking radiopharmaceutical: correlation with gross and microscopic pathology.
abstract: Meningioma is one of the neoplasms in which there may be extraosseous localization of bone-seeking radiopharmaceuticals. Tumor calcification, calvarial erosion, and the formation of reactive bone have been proposed as the cause of this abnormal tracer localization. We present a patient with a frontal meningioma that was evaluated using 99mTc-methylene-diphosphonate bone scintigraphy, head computed tomography, and skull radiography; the homogeneous density seen in the radiographic studies corresponded to the area of bone-seeking-agent localization shown in the scintigram. At autopsy, bony tissue and a few psammoma bodies were found in the meningioma, and apparently accounted for the bone-tracer localization. There was no calvarial erosion and no formation of reactive bone. If skull-radiographic studies show a homogeneous, radio-opaque lesion with no reactive changes in the adjacent skull, a meningioma showing a localization of a bone-seeking radiopharmaceutical may be predicted to have bone-tissue formation with or without psammoma bodies.
mesh_terms: D000368:Aged; D001921:Brain / Q000473:pathology; D005260:Female; D006801:Humans; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D008579:Meningioma / Q000000981:diagnostic imaging* / Q000473:pathology; D011877:Radionuclide Imaging; D013669:Technetium Tc 99m Medronate; D014057:Tomography, X-Ray Computed
chemical_list: D013669:Technetium Tc 99m Medronate