Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . the cells of the pia and arachnoid. Thisstatement does not comprise those epithelial tumors which are properlyclassed as cancerous. 340 LECTURES ON NERVOUS DISEASES. Fsammoma or sand-tumoi-K consist of granules of carbonate of limeheld in a matrix of connective-tissue, in whose meshes concentric layersof epithelial cells are also found. (Virchow.) They are encounteredchiefly in the dura (particularly in that part which covers
Lectures on nervous diseases from the standpoint of cerebral and spinal localization, and the later methods employed in the diagnosis and treatment of these affections . the cells of the pia and arachnoid. Thisstatement does not comprise those epithelial tumors which are properlyclassed as cancerous. 340 LECTURES ON NERVOUS DISEASES. Fsammoma or sand-tumoi-K consist of granules of carbonate of limeheld in a matrix of connective-tissue, in whose meshes concentric layersof epithelial cells are also found. (Virchow.) They are encounteredchiefly in the dura (particularly in that part which covers the parietallobe) and in the choroid plexus of the fourth ventricle. Gholesteatomata, or pearl-tumorh^ are composed of cholesterine andstearine. They are destitute of vessels. Their size is, as a rule, are known to arise from the bones, meninges, and in the brain itself. Tumors of the osseous type spring, as a rule, from the calvaria. Inrare instances, however, they do not do so. The falx is sometimes moreor less osseous. True ossific deposits have been encountered within thebrain-substance. I lately- discovered one in the brain of an Fig. 90.—Syphilis op the Bkain. (Aft^^rFox.) Fibrous, fibro-pJastie, and faff;/ r/roufhs within the skull are to beclassed as accidental neoplasms. The fibro-plastic variety has beenknown to attain the size of an orange. (Hammond.) The consistenceof these tumors is subject to extreme variations. Fibrous tumorsare rare, but they may arise from the ependyma of the reports seventeen to have deAeloi)ed simultaneously within thelateral ventricle. Hydatids (when present) are generally detected within the cerebralhemispheres. The parasite {echinococcus) is enveloped in a cyst, whichmay be as large as an orange. The number of such cysts is usualljsmall. They are often solitary. Another form of parasitic tumor (due to the cysticercus) may beencountered within the brain-substance. The surrounding cyst is usu
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