The case of a patient with hystologically confirmed meningeoma is reported. The tumor extended continuously over the entire cerebral convexity and promoted remarkable hyperostosis of the skull. Headache, blindness, increased skul and convulsions were the main clinical manifestations. The two laminae of the skull were replaced by spikes radially arranged, as suggested by the X-ray picture and confirmed at necropsy. The hystologic aspect of the tumor did not show evidence of malignity.