By M. Lemmerling MD, PhD (auth.), Marc Lemmerling MD, Spyros S. Kollias MD (eds.)

This quantity presents a whole evaluate of the imaging of the conventional and diseased petrous bone. After an creation describing the anatomy of the realm, next chapters deal with many of the ailments and prerequisites affecting the petrous bone which are encountered in day-by-day perform. initially of every of those chapters an otologist explains what's anticipated of the radiologist. some of the vintage imaging equipment are defined and mentioned intimately, and person chapters are incorporated on more recent recommendations equivalent to useful imaging and digital imaging. Imaging findings are documented because of quite a few informative fine quality illustrations. This ebook, with its straight forward constitution dependent basically on topography, will end up of titanic price in day-by-day practice.

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11). Sometimes, the lesions have a more osteolytic aspect with regions of dense calcification within them (Fig. 12; Brown et al. 1995). On CT, the bone remodeling associated with a middle fossa meningioma may roughly mimic fibrous dysplasia; however, in meningioma the thickened Fig. 11. Axial CT image. Enlargement of the squamous part of the left temporal bone, showing the typical ground-glass appearance of fibrous dysplasia; the enlargement of the bone causes stenosis of the external ear canal (arrowhead).

6. In the radiologic report on suspected cholesteatoma cases it is important that the radiologist mention whether the sinus tympani is aerated or not. The sinus tympani is difficult to visualize otoscopically and even surgically. Providing this information is especially important in cases of pars tensa cholesteatoma. 3 CT or MRI? High-resolution computed tomography (HRCT) with bone window settings is considered the method of choice for examination of the middle ear structures. It 41 provides excellent contrast between osseous structures, air, and soft tissues, together with a high spatial resolution.

Both sides of the sphenoid bone, left ethmoid bone, and squamous part of the right temporal bone show expansion of the bone, with a mixed osteolytic appearance, areas of dense calcifications, and partly a ground-glass appearance (a, b). Stenosis of the left external ear canal by the bone expansion (c, arrow) Vrabec and Chaljub (2000) identified several possible causes. ” These cases present as invagination of skin through a defect in the posterior canal wall or as a subepithelial mass lesion. Imaging revealed destruction of the canal wall lateral to the scutum.

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