![]() Millen SJ, Daniels D, Meyer G (1990) Gadolinium-enhanced magnetic resonance imaging in facial nerve lesions. Gardner G, Robertson JH (1985) Facial nerve function in cerebellopontine angle tumor surgery. Glasscock ME III, Hayes JW, Jackson CG, Steenerson RL (1978) A one-staged combined approach for the management of large cerebellopontine angle tumors. Indications for internal auditory meatus(iams) MRI scan. Am J Otol 10: 174–176Ĭohen NL, Ransohoff J (1984) Hearing preservation - posterior fossa approach. measurable parameters of internal auditory canal (IAC) magnetic resonance imaging (MRI) in patients with idiopathic sudden sensorineural hearing loss. In the patient who cannot have an MRI study, a contrast computed tomography with thin cuts through the region of the internal auditory meatus will show most. Valvassori GE, Guzman M (1989) Growth rate of acoustic neuromas. Radiology 174: 93–98īurke JW, Podrasky AE, Bradley WG (1990) Meninges: benign postoperative enhancement on MR images. AJNR 9: 27–34Įlster AD, DiPersio DA (1990) Cranial postoperative site: assessment with contrast-enhanced MR imaging. Lanzieri CF, Larkins M, Mancall A, Lorig R, Duchesneau PM, Rosenbloom SA, Weinstein MA (1988) Cranial postoperative site: MR imaging appearance. Glasscock ME, Shambaugh GE, Johnson GD (1990) Surgery of the ear. Glasscock ME, Kveton JF, Jackson SC, McKennan KX (1986) A systematic approach to the surgical management of acoustic neuroma. Mueller DP, Gantz BJ, Dolan KD (1992) Gadolinium-enhanced MR of the postoperative internal auditory canal following acoustic neuroma resection via the middle fossa approach. In group 4, grafts may prevent adequate visualization of the IAC. In group 3 residual or recurrent tumor cannot be excluded. ![]() Whether follow-up in these groups is indicated needs to be determined. In groups 1 and 2, the MRI features correlate well with complete tumor removal. ![]() In group 4, follow-up in 1 of the 2 patients was stable. ![]() perpendicular to the plane of the internal auditory canal.7. MRI showed duplicated and narrow right IAC with non-visualisation of right cochlear nerve and normal facial nerve in the anterosuperior canal (figure 2). In group 3 follow-up showed 1 tumor recurrence (surgically confirmed) and 4 stable abnormalities. Keywords: Sensorineural hearing loss, imaging, CT, MRI. In group 2, dural enhancement remained unchanged in 5 patients and decreased in 3. Prospective 1-to 2-year follow-up studies were available in 8, 5, and 1 patients in groups 2, 3, and 4 respectively. We found four patterns (1) internal auditory canals (IAC) with nonenhancing soft-tissue strands, possibly scars or distorted residual nerves (8) (2) IAC with marginal enhancement-reactive dura mater (16) (3) IAC with contrast-enhancing globular tissues suggesting residual or recurrent tumour (5) (4) high-signal intensity in the IAC before contrast medium administration, probably related to graft with fat/fascia/muscle (2). Follow-up MRI was performed after 1–2 years on patients with questionable abnormalities. Prospective baseline MRI was obtained on 31 patients who had “total” removal of acoustic schwannoma 6 months to 9 years previously. ![]()
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