Comparison of three-dimensional fast spin echo and gradient echo sequences for high-resolution temporal bone imaging. Ex vivo and in vivo imaging of the inner ear at 7 Tesla MRI. van Egmond SL, Visser F, Pameijer FA, Grolman W. Visualization of human inner ear anatomy with high-resolution MR imaging at 7T: initial clinical assessment. van der Jagt MA, Brink WM, Versluis MJ, et al. 3-T imaging of the cochlear nerve and labyrinth in cochlear-implant candidates: 3D fast recovery fast spin-echo versus 3D constructive interference in the steady state techniques. Lane JI, Ward H, Witte RJ, Bernstein MA, Driscoll CLW. In addition, the features at pre- and postprocedural MRI will be discussed to help ensure that diagnostic radiologists may be of greatest use to the ordering physicians. The purpose of this review is to provide an overview of the most useful MRI sequences for internal auditory canal and labyrinthine imaging, review the relevant anatomy, and discuss the expected appearances of the most commonly encountered pathologic entities. Nevertheless, despite the widespread use of MRI for these purposes, many radiologists remain unfamiliar with the complex anatomy and expected imaging findings with such examinations. It is also extensively used in pre- and postoperative evaluations, particularly in patients with vestibular schwannomas and candidates for cochlear implantation. It is used to evaluate normal anatomic structures, evaluate for vestibular schwannomas, assess for inflammatory and/or infectious processes, and detect residual and/or recurrent cholesteatoma. (bottom) Can you spot the tumor?Ĭholesteatoma visible in the petrous bone, adjacent to the inner ear structures (Yellow arrow).MRI is firmly established as an essential modality in the imaging of the temporal bone and lateral skull base. (middle) Acoustic neuroma (tumor) filling internal auditory canal. (top) IACS demonstrating nerves in internal auditory canal (Yellow arrow), blood vessel crossing nerves (Blue arrow) and cochlea and semi-circular canals (Green arrow). If you receive the contrast agent, the entire MRI exam will then take approximately 1 hour. The type of contrast agent we use has been validated to be one of the safest types available. We may require you to have a blood test before this procedure. For some conditions, we may need to administer an intravenous injection of an MRI contrast agent (dye). The entire MRI exam will take approximately 15 minutes. In addition, if your physician suspects a type of tumor known as a cholesteatoma, we utilize a very specialized method of imaging specific for this condition known as diffusion-weighted imaging (DWI). Your doctor may refer you for this exam to determine if there is a structural cause for hearing loss, tinnitus (ringing in the ears), dizziness or inner ear pain. We are also able to assess the inner ear structures such as the cochlea and semi-circular canals. MRI of the Internal Auditory Canals (IACs) allows visualization of the auditory and facial nerves as they pass through the internal auditory canal. In these cases, an additional $300 will be charged. While most MRI exams of the IACs do not require contrast, there are some indications where contrast would be beneficial. MRI of the Internal Auditory Canals (IACs)
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