. Diseases of the nervous system : for the general practitioner and student. ually increased, so that the entire brain is wet (oedema) andinternal hydrocephalus may be produced. The latter condition isparticularly marked in tumors situated in the vicinity of the openingsconnecting the ventricles, as, for example, near the middle lobe of thecerebellum or the quadrigeminal bodies. When pressure from the tumoror from the hydrocephalus is produced toward the base of the brain, thecranial nerves are involved. The increased intracranial pressure produces an obstacle to the freecerebral circulation t
. Diseases of the nervous system : for the general practitioner and student. ually increased, so that the entire brain is wet (oedema) andinternal hydrocephalus may be produced. The latter condition isparticularly marked in tumors situated in the vicinity of the openingsconnecting the ventricles, as, for example, near the middle lobe of thecerebellum or the quadrigeminal bodies. When pressure from the tumoror from the hydrocephalus is produced toward the base of the brain, thecranial nerves are involved. The increased intracranial pressure produces an obstacle to the freecerebral circulation thus causing an increase of the intracranial venouspressure. The latter has a direct effect on the cerebro-spinal fluid thus 146 TUMORS OF THE BRAIN rising its pressure. As the increase of this fluid is not only in the craniumbut also in the spinal canal, the arachnoid of the latter becomes distendedand the posterior nerve-roots are thus over-extended. Degenerativechanges of these roots and of the posterior columns are not infrequentlymet with in cerebral tumors (Fig. 72).. Fig. 72.—Tremor (Round-cell sarcoma.) Wedged in between the L. Frontal andTemporal Lobes, Penetrating the Lateral Ventricle. (Original.) Symptoms.—They are (A) general and (B) local. A. The general symptoms are common almost to all forms of tumorsirrespective of their seat and nature. They are: headache, vomiting,vertigo, optic neuritis, general convulsions, insomnia, mental failure withdepression. Headache.—This is one of the earliest symptoms. It has no definite TUMORS OF THE BRAIN 147 seat and it rarely corresponds to the seat of the tumor. It is deep andpersistent; it is usually continuous and sometimes excruciating. It maybecome aggravated upon slight pressure with the hand (which suggestsan involvement of the skull or of membranes) or upon a slight motion ofthe head, upon coughing or forced respiration. It is usually progressivein intensity in the course of the disease and not relieved by ordinary
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnervous, bookyear1913
