الفهرس 
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Abstract
Aim of the work
To study the normal anatomy and variations of the petrous bone using high resolution CT.
Summary
There are many clinical implications of this new methodology. CT provides a precise technique for the evaluation of soft-tissue masses within the air-filled middle ear and mastoid. Defining the extent of erosion or destruction of the walls of the middle ear, the capsule of the semicircular canals, and the ossicular chain is crucial in the evaluation and treatment of cholesteatomas and other middle ear lesions. It is also very helpful in evaluating postoperative complications from mastoidectomy. CT is especially useful in assessing the tympanic membrane and in visualizing partly hidden structures such as the sinus tympani. Detailed anatomic knowledge of normal anatomic variations very valuable to the otologic surgeon.
Also detailed anatomic knowledge is essential for the increasingly important role that high resolution CT can be expected to have in the evaluation of the normal and abnormal temporal bone.
In this study some important normal variations are detected such as anteriorly and laterally placed sigmoid sinus, dehiscent jagular fossa, deep sinus tympani and large cochlear aqueduct.