By Peter D. Phelps MD, FRCS, FRCR, DMRD, Glyn A. S. Lloyd MA, DM, FRCR (auth.)
This can be a finished survey of imaging of the petrous temporal bone; it contains the imaging appearances of either infrequent and customary pathology. all of the most modern imaging concepts are incorporated, specifically magnetic resonance with the recent paramagnetic distinction agent Gadolinium DTPA. establishing chapters supply an account of imaging strategies and basic anatomy and are by means of chapters on congenital ear affliction, trauma, inflammatory illness and neoplasia; acoustic neuroma is given a separate part. the 2 concluding chapters are on vertigo and otosclerosis.
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And now reliably demonstrated on sectional imaging. There is considerable variation in Cochlear Aqueduct the course between individuals, depending on the degree of surrounding pneumatisation. There have The cochlear aqueduct is a narrow channel running been comprehensive descriptions of the radioin a slightly S-shaped curve from the basal turn of graphic anatomy of the vestibular aqueduct, par- The Inner Ear 27 Vestibular aqueduct Endolymphatic duct Endolymphotic sac Subarachnoid space Fig. 6. The·labyrinth and the cochlear and vestibular aqueducts.
Compare with the opposite normal side at the level of the basal turn of cochlea. b. Internal carotid angiogram confirms that the artery lies lateral to the vestibule (V) in the middle ear. and inferior petrosal sinuses. The foramen is bounded medially by the occipital bone and laterally by the temporal bone. A giant jugular foramen needs to be distinguished by its clear-cut margins from a pathologically expanded one. Anatomy and Development of the Ear The anatomy has been comprehensively reviewed by Graham (1975).
This was confirmed at surgery and a muscle pack in the hypotympanum cured the leak. In another case a 48 Imaging Investigation of Congenital Deafness a large tract extending to the middle ear below the cochlea was shown by base CT sections. Via the Petromastoid Canal b Fig. 13 a. Perorbital view showing the labyrinth and hypoplasia of both petrous pyramids. b Hypoplastic petrous pyramids with a bone defect in the region of Hyrtl"s fissure. The axial CT air cisternogram shows air in the jugular fossa on the affected side.