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Raimund P. Firsching, Walter Heindel, Ralf-Ingo Ernestus, Reinhold A. Frowein, and Jürgen Bunke

P ostoperative magnetic resonance imaging (MRI) is gaining increasing importance in neurosurgical practice. We use a 0.5-Tesla imaging system with a superconductive magnet, and have recently encountered three cases with unexpected MRI findings. These cases are described and a possible cause suggested. Case Reports Case 1 This 53-year-old woman with cervical myelopathy underwent ventral fusion of the C4–5 and C5–6 vertebrae. A plain x-ray film of the cervical spine demonstrated a satisfactory postoperative result ( Fig. 1 left ). There was no

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Warwick J. Peacock and Judith A. Murovic

lower end of the cord extended to the first sacral segment where it was clearly tethered to the surrounding meningocele wall. Intramedullary cysts with a beaded appearance extended from the level of the midthoracic spine to the lumbosacral area ( Fig. 1 ) and a Schmorl's node defect was found to involve the inferior and superior end-plates of L-4 and L-5, respectively. Fig. 1. Case 1. T 1 -weighted magnetic resonance images showing sagittal (left) and coronal (right) views of the thoracolumbar spine. The myelocystocele is visualized in the sagittal view

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Kohkichi Hosoda, Norihiko Tamaki, Michio Masumura, and Satoshi Matsumoto

B rain-stem encephalitis is a rare disorder. The classical form is characterized by acute progressive ophthalmoplegia, ataxia, and hyporeflexia; patients suffering from this condition usually recover completely. 1 The computerized tomography (CT) scan is frequently normal, but occasionally shows a low-density lesion in the brain stem. 1 We report a patient with brain-stem encephalitis who presented with right abducens palsy and ataxia. The appearance on CT scanning and magnetic resonance imaging (MRI) is described. Case Report This 44-year-old man

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Alistair Jenkins, Donald M. Hadley, Graham M. Teasdale, Barrie Condon, Peter Macpherson, and James Patterson

, following the guidelines of the National Radiological Protection Board. 17 Informed consent was obtained from all patients or their relatives prior to their inclusion in the study. Magnetic Resonance Imaging Imaging was performed on a Picker 0.15-tesla resistive system operating at 6.3 MHz. The development of compatible monitoring and cardiorespiratory support apparatus 15, 16 enabled patients to be imaged safely. Blood pressure, heart rate, and respiration were continuously monitored; electrocardiography was performed during patient transfer, data processing

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John L. Doppman, Giovanni Di Chiro, Andrew J. Dwyer, Joseph L. Frank, and Edward H. Oldfield

feasible, although involvement of the posterior columns of the spinal cord may be encountered. When the nidus is dural in location, surgery is feasible with minimal risk by either ablating the dural nidus or disconnecting it intradurally from the veins of the cord. 9 Our early experience 2 with magnetic resonance imaging (MRI) of six spinal AVM's established that MRI can identify a major intramedullary component, thereby distinguishing intramedullary AVM's from posterior extramedullary and dural lesions. In addition, we demonstrated the ability of MRI to identify

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Kohkichi Hosoda, Norihiko Tamaki, Michio Masumura, Satoshi Matsumoto, and Fumio Maeda

R ecent reports have described the appearance of chronic subdural hematomas on magnetic resonance imaging (MRI). 7, 11, 12, 15 The superiority of MRI over computerized tomography (CT) has already been shown. Here we summarize our experience using MRI on 20 chronic subdural hematomas and discuss the mechanism of changes in relaxation times. Materials and Methods The study was conducted on 20 chronic subdural hematomas from 18 patients (five females and 13 males, aged 4 months to 81 years). The MRI studies were carried out at Shinsuma Hospital with a

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Bowen Y. Wong, Gary K. Steinberg, and Larry Rosen

division. He had slightly decreased sensitivity to pinprick over the left second and third divisions. Formal auditory assessment showed a mild sensorineural hearing impairment on the left, compared with the right, in the higher frequencies. The left acoustic reflex amplitude was notably less than on the right, suggesting mild left seventh and eighth nerve dysfunction. The remainder of the neurological examination was normal. The patient decided on surgical treatment for this trigeminal neuralgia. Magnetic resonance imaging was performed on a General Electric Signa

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Magnetic resonance imaging of spinal meningiomas and neurinomas

Improvement of imaging by paramagnetic contrast enhancement

Gerhard Schroth, Armin Thron, Lothar Guhl, Karsten Voigt, Hans-Peter Niendorf, and Luis Rios-Nogales Garces

the rare earth element Gd and DTPA. Written informed consent was obtained in each case. Myelography and high-resolution CT using a Siemens Somatom ‡ with a 512 × 512 matrix served as comparative diagnostic methods ( Table 1 ), and all lesions investigated with Gd-DTPA were confirmed surgically. TABLE 1 Comparative diagnosis by various neuroradiological procedures in eight cases of meningioma or neurinoma Case No., Age (yrs), &Sex Clinical Features Myelography Computerized Tomography Magnetic Resonance Imaging (MRI) Findings

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Robert B. Friedman, Ricardo Segal, and Richard E. Latchaw

, and sylvian and cerebellopontine angle cisterns. However, about 25% to 30% of intracranial lipomas are located in the corpus callosum. 12 Lipoma of the quadrigeminal plate cistern causing symptoms of hydrocephalus is even rarer, and only a handful of cases have previously been presented in the literature. 4, 6, 14 In addition, lipoma of the superior medullary velum has also been described. 5 Although CT scanning has been of great assistance in the premorbid diagnosis of these lesions, 16 the recent development of magnetic resonance imaging (MRI) has allowed a

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Lee Walton, Anna Hampshire, Paul Vaughan, David M. C. Forster, Andras A. Kemeny, and Matthias W. R. Radatz

. References 1. Coombs BD , Szumonski J , Nguyen TT , et al : Geometric distortion of stereotactic MRI. Proc Soc Magnet Reson 1 : 526 , 1994 (Abstract) Coombs BD, Szumonski J, Nguyen TT, et al: Geometric distortion of stereotactic MRI. Proc Soc Magnet Reson 1: 526, 1994 (Abstract) 2. Walton L , Hampshire A , Forster DMC , et al : A phantom study to assess the accuracy of stereotactic localization, using T1weighted magnetic resonance imaging with the Leksell stereotactic system