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  • Title: Primary intraosseous meningiomas.
    Author: Arana E, Diaz C, Latorre FF, Menor F, Revert A, Beltrán A, Navarro M.
    Journal: Acta Radiol; 1996 Nov; 37(6):937-42. PubMed ID: 8995470.
    Abstract:
    PURPOSE: A retrospective study was performed to evaluate the clinical, radiological and histological findings of 14 intraosseous meningiomas. MATERIAL AND METHODS: 14 histologically proved intraosseous meningiomas were studied with plain skull film and CT. Pathological records were reviewed. RESULTS: We found 9 calvarial cases and 5 spheno-orbital ones. The most common symptom in the calvarial cases was a lump in the scalp, and in the spheno-orbital lesions it was exophtalmos. Hyperostosis was present in all 5 spheno-orbital cases and in 3 out of the 9 calvarial ones; in the other 6 cases it had a mixed pattern. Enhanced dura was present in 3 calvarial cases and in 2 sphenoidal ones. Dura was involved in 5 cases: 2 with inflammatory changes, 2 with a minimal intradural tumour and one with a subdural tumour. CONCLUSION: CT better detected both the bony reaction and the intraosseous extension of the tumour. The dural changes were not specific of tumoural involvement. The differential diagnosis comprises: fibrous dysplasia, osteoma, blastic metastasis and mainly meningioma en plaque (MEP). Comparing our findings with other series, we noticed that in some cases the term MEP was used for similar cases. As the name MEP is merely descriptive and both entities share a larger number of similarities than differences, we believe that a differentiation between hyperostotic en plaque meningioma and intraosseous meningioma can hardly be made.
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