Herniations of brain tissue through small perforations in the dura mater have been reported infrequently since von Recklinghausen1 noted the condition in 1870.2 Several other cases3 have been reported besides the ten summarized and discussed by Wojno4 in 1912 and the fifty-one which Franz5 (1926) recorded in a systematic study of 225 consecutive necropsies or 22.6 per cent.
In a study of the dura in fifty-nine consecutive cases at necropsy in the Mayo Clinic, so-called physiologic herniations of the brain were found in eleven cases, or 18.5 per cent. Table 1 summarizes briefly the type of case in which the dura was studied, the age of the patient and the occurrence of herniations in each group according to the age and the type of case.
In table 1, "other lesions of the central nervous system" include apoplexy, hydrocephalus, general paralysis, epilepsy, neurofibromatosis, etc. It may
BROCKBANK TW. PHYSIOLOGIC HERNIATIONS OF THE BRAIN. Arch NeurPsych. 1928;20(1):138–144. doi:10.1001/archneurpsyc.1928.02210130141008
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