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Department of Pathology Department of Neurosurgery. Marmara University, School of Medidne, İstanbul, TURKEY Six meningiomas with abundant hyaline inclusions (pseudopsammoma bodies) were studied in means of a panel of conventional histochemistry. In all six cases, the inclusions were PAS-positive, diastase resistant and stained picrophilic (yellow-bright orange) with van Gieson. Negative staining was obtained by von Kosa, Congo red and Gomori's reticulin. A remarkable pericytic proliferation around the vessel wall was found in five cases. It is concluded that secretory meningioma is a distinct type of meningioma. It shows characteristic lightmicroscopic, ultrastructural and immunohistochemical features of epithelial and secretory differentiation. Keywords : Meningioma. Secretory meningioma, Hyaline inclusion, Histochemistry