A text-book of the diseases of the ear for students and practitioners . he meatus. At the posteriorpart of the membrana tympani an oval perforation was found, through whichseveral ragged growths had forced their way. 766 DISEASES OF THE EAR An irregular, nodular, ovoid tumour about the size of an orange was alsodiscovered at the base of the skull, which occupied the entire right petrousportion of the temporal bone, and which extended forwards into the rightmiddle, and backwards into the posterior, cranial fossa. It was ossified insome parts, while in others sharp ridges of bone projected into
A text-book of the diseases of the ear for students and practitioners . he meatus. At the posteriorpart of the membrana tympani an oval perforation was found, through whichseveral ragged growths had forced their way. 766 DISEASES OF THE EAR An irregular, nodular, ovoid tumour about the size of an orange was alsodiscovered at the base of the skull, which occupied the entire right petrousportion of the temporal bone, and which extended forwards into the rightmiddle, and backwards into the posterior, cranial fossa. It was ossified insome parts, while in others sharp ridges of bone projected into the spongyportions of the tumour. The entrance into the internal auditory meatus was greatly acoustic and facial nerves were thin and of a light gray colour. Ina section through the petrous bone made parallel to its posterior surface(Fig. 334), the bone was found to be traversed by numerous small and largecavities (c), from the walls of which round and irregular excrescences grewinto their lumens; from the upper part of the petrous bone (b) a radiating. Fig. 333.—Spindle-celled Sarcoma of the Auditory Nerve, the sizeof a Walnut, growing into the Internal Meatus. o, Tympanic cavity with malleus and incus ; v, Vestibule ; c, Cochlea ; T, Sarcomaof the auditory nerve ; n, The new growth extending into the internal meatus. osseous framework (a) arose, which was composed of strong osseous lamella.,and to the upper edge of which a large cavernous framework was attached (d),which contained a sanguineous fluid and coagula. The microscopic examina-tion of the polypus, which had been removed from the external meatus,showed that it was a cavernous angioma with branching ridges of bone, andthat it was in communication with the hew growth in the petrous tumour probably had its origin in the lateral sinus which communi-cated with the cavities of the cavernous angioma. The inferior parts of theright temporal and occipital lobes were deeply depressed, corresponding to
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