MR imaging of CNS tractopathy: wallerian and transneuronal degeneration.
نویسندگان
چکیده
منابع مشابه
MR imaging of Wallerian degeneration in the brainstem: temporal relationships.
Degeneration of the myelin sheath and axon distal to the most proximal site of axonal interruption secondary to axonal disease has been called wallerian degeneration. On MR imaging, wallerian degeneration of the pyramidal tract can be observed as an abnormal signal intensity, showing prolonged T1 and T2 relaxation times that correspond to the corticospinal tract, with or without shrinkage of th...
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PURPOSE To describe the MR manifestations and temporal course of wallerian degeneration that occurs above and below a spinal cord injury, and to compare the MR findings with postmortem histopathology. METHOD Twenty-four postmortem spinal cords from patients with cervical (n = 14), thoracic (n = 6), and lumbar (n = 4) cord injuries were studied with axial T1- and T2-weighted spin-echo MR imagi...
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To investigate the role of MR imaging in wallerian degeneration, a series of animal models of increasingly complex peripheral nerve injury were studied by in vivo MR. Proximal tibial nerves in brown Norway rats were either crushed, transected (neurotomy), or transected and grafted with Lewis rat (allograft) or brown Norway (isograft) donor nerves. The nerves distal to the site of injury were im...
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Three MR imaging techniques were compared in 37 CNS examinations. In each case, postprocessing of a single data set in three different ways was used for comparison. Eleven of the 37 patients had a clinical diagnosis of multiple sclerosis. The primary purpose of this investigation was to evaluate the quality of the half-Fourier imaging technique. With half-Fourier imaging, scan time can be reduc...
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BACKGROUND AND PURPOSE CNS tuberculosis may simulate other granulomas and meningitis on MR images. The purpose of this study was to improve the characterization of lesions in CNS tuberculosis and to assess the disease load using magnetization transfer (MT) imaging. METHODS A total of 107 tuberculomas in seven patients with or without meningitis and 15 patients with tuberculosis meningitis alo...
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ژورنال
عنوان ژورنال: American Journal of Roentgenology
سال: 1998
ISSN: 0361-803X,1546-3141
DOI: 10.2214/ajr.171.3.9725322