Diseases of the nervous system : a text-book of neurology and psychiatry . these symptoms. The vertigo and vomitingare set up by changes in position of the head; sudden movement ofthe head may cause immediate unconsciousness. Cerebellar ataxia,mild nystagmus and occasionally diplopia are other signs. One more word may be said about cerebellar tumors and theirdiagnosis. They may, in the presence of few signs only, be mistaken CEREBELLOPONTINE ANGLE TUMORS 421 for affections of the frontal lobes (frontocerebellar paths), parietallobes (implications of central sensory components and of the optict
Diseases of the nervous system : a text-book of neurology and psychiatry . these symptoms. The vertigo and vomitingare set up by changes in position of the head; sudden movement ofthe head may cause immediate unconsciousness. Cerebellar ataxia,mild nystagmus and occasionally diplopia are other signs. One more word may be said about cerebellar tumors and theirdiagnosis. They may, in the presence of few signs only, be mistaken CEREBELLOPONTINE ANGLE TUMORS 421 for affections of the frontal lobes (frontocerebellar paths), parietallobes (implications of central sensory components and of the opticthalamus). In frontal lobe tumors special intelligence defects are usually found,if carefully examined for by the methods of Ziehen, Sommer, andKraepelin. The tremor is apt to be very fine and rapid, hemiparesis,if present, is crossed, and shows spastic phenomena; the speech dis-turbance is aphemic; the conjugate deviations are irritative and notparalytic. Then anosmia, apraxia, and aphasia are often added. Skewdeviations, and hypotonus are not known for frontal Fig. 223.—Tumor (neurofibroma) of cerebellopontine angle. (Larkin.) Parietal lobe disease only occasionally offers difficulties, while thecharacteristic sensory disturbances and central pains of optic thalamusinvolvement should exclude this structure. Cerebellopontine Angle Tumors.^-—These should be discussed herebecause of the symptoms of cerebellar pressure and of vestibular Henschen, F., Ueber Geschwiilste der liinteren Schadelgrube imbescndere des Klein-hirnbrlickenwinkels, 1911, for full literature to date; also English literature, Fraenkeland Hunt, Medical Record, 1903, and Medical News, 1904; Stewart and Holmes, Brain,1904; Weisenberg, Jour. Amer. Med. Assoc, 1908; Starr, Jour. Nerv. and Ment. Dis.,1910; Lewandowsky, Handbuch der Neurologic. 422 CEREBELLAR SYNDROMES involvement. Two main types of tumor come under review. Thosefrom the pia of the cerebellum, and those growing on or about theeighth nerv
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