The literature is rich in valuable information on the anatomy and clinical manifestations of primary tumors of the brain. It is rather poor in its yield of similar data in relation to metastatic tumors of the brain. Yet the latter are not rare, as shown by several reliable statistical studies in which the occurrence of metastatic tumors as compared with that of other expanding intracranial lesions is considered. Thus, in the Cushing analysis of 2,000 verified brain tumors1 the metastatic neoplasms of the brain constituted 4.2 per cent. Walshe2 gave a somewhat higher incidence of metastatic tumors of the brain, his figures being 6.4 and 7.7 per cent for carcinoma and sarcoma, respectively, in a total of 642 cases of brain tumor. Dandy3 gave 10 per cent as a rather rough estimate of the incidence of metastatic neoplasms among tumors of the brain of all varieties. Adson,
GLOBUS JH, MELTZER T. METASTATIC TUMORS OF THE BRAIN. Arch NeurPsych. 1942;48(2):163–226. doi:https://doi.org/10.1001/archneurpsyc.1942.02290080009001
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