Since the classical article of M. B. Schmidt meningeal tumors have been generally considered to arise from clusters of arachnoidal cells, and controversy concerning them has been largely terminological. Many have objected to the common term dural endothelioma on the grounds that the tumors arise from the arachnoidal membrane and that the neoplastic cells are not endothelial. Mallory, followed by Penfield, tried to prove that the typical cell in these tumors is a fibroblast and that, therefore, they should be called fibroblastomas. Cushing avoided the issue by speaking of them simply as meningiomas. But whatever the term used, it was, until lately, believed that these tumors were of mesodermal origin.

The matter was complicated by Oberling when he published his theory that the leptomeninx was of neuro-ectodermal origin. The French pathologists soon began to speak of neuro-epithelial and gliomatous types of meningeal tumors.

In view of the existing confusion in terminology, we have, during the past two years, been trying to form a personal opinion concerning these tumors. From our own clinic and through the kindness of numerous friends we have secured a considerable material for study, and our investigations have made us dissatisfied with the present terminology. We have found at least nine distinct histological types of tumors arising in the meninges. We will give an example of each of these and then our opinion concerning what conclusions can reasonably be drawn from their study as to the origin and nature of meningeal tumors in general.

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