By Marc Lemmerling, Bert de De Foer
This ebook offers a whole evaluate of imaging of ordinary and diseased temporal bone. After description of symptoms for imaging and the cross-sectional imaging anatomy of the world, next chapters deal with some of the ailments and stipulations that impact the temporal bone and usually are encountered usually in medical perform. The vintage imaging tools are defined and mentioned intimately, and person chapters are integrated on more moderen options resembling practical imaging and diffusion-weighted imaging. there's additionally a robust specialise in postoperative imaging. all through, imaging findings are documented by way of quite a few informative, top quality illustrations. Temporal Bone Imaging, with its ordinary constitution established primarily on topography, will turn out of sizeable worth in day-by-day practice.
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Extra info for Temporal Bone Imaging
A Axial T2weighted spin echo image shows large, relatively hypointense mass, extending posteriorly into the mastoid cells (arrow). Anteriorly, the mass (arrowhead) cannot be separated from the superior pole of the parotid gland. b Coronal gadolinium-enhanced T1-weighted spin echo image. The tumour (arrows) grows deep into the external ear canal (asterisk), reaching the tympanic membrane. The ossicular chain is visible as it is surrounded by enhancing tissue (arrowhead); this corresponded histologically to granulation tissue 7 Malignant Neoplasms Primary external ear malignant neoplasms are not common.
With further tumour growth, surrounding structures, such as the parotid gland, temporomandibular joint and middle ear are likely to become involved. Also intracranial spread is possible (Figs. 25 and 26). Tumour spread to the neck lymph nodes may occur; the parotid and upper parajugular lymph nodes are at risk and an imaging study of the neck is therefore desirable. MRI is frequently used as an adjunct to CT when intracranial, perineural and/or perivascular tumour spread is suspected (Fig. 25).
Treatment is by radiotherapy, surgery or a combination of both. After radical treatment of extensive neoplasms, it is useful to obtain a baseline imaging study (optimal timing probably about 4 months after completion of treatment), and to perform periodical follow-up imaging studies, in order to detect recurrent tumour at an as early as possible stage (Million et al. 1994). Malignant neoplasms secondarily invading the external auditory canal may arise from neighbouring structures, such as the periauricular skin or parotid gland.