الفهرس 
Introduction And Aim Of TheOnly 14 pages are availabe for public view
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Abstract
Purpose: to discuss the role of Computed Tomography and Magnetic Resonance Imaging in evaluation of pulsatile tinnitus. Patients and Methods: This work included 29 patients; 8 males and 21 females. Their age ranged from 21 to 64 years, (mean age 40 years). All patients were subjected to history taking, clinical examination, otoscopy, audiometry and CT & MRI. Results: According to the otoscopic finding of a retrotympanic mass, patients were divided into two groups: Group A included 5 patients with retrotympanic mass, and Group B included 24 patients with no retrotympanic mass. In group A patients non contrast HRCT of the temporal bone showed the enlargement and erosion of the jugular foramen in 3 patients with glomus jugulare tumors, the extensive bone destruction in 1 patient with temporal bone metastases, and the intact jugular plate in 1 patient with inflammatory mass in the middle ear. Post contrast CT and MRI showed the enhancement characteristics of the mass and the intracranial extension in 3 patients. In group B patients non contrast HRCT of the temporal bone was normal in 22 patients, while MRI showed showed 2 intraventricular tumors in 2 patients, and 2 nasopharyngeal masses in yet 2 other patients. MRA showed 1 patient with extracranial aneurysm, 1 patient with scalp AVM, and 1 patient with stenotic segment of the internal carotid artery. Conclusion: In the presence retrotympanic mass, HRCT of the temporal bone is the investigation of choice. If there is no retrotympanic masses then non contrast MRI of the brain and temporal bones is the initial investigation together with 3D TOF MRA.