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Neurology 2002;59:1766-1771
© 2002 American Academy of Neurology

Axonal damage in the spinal cord of MS patients occurs largely independent of T2 MRI lesions

E. Bergers, MD PhD, J.C.J. Bot, MD, C.J.A. De Groot, PhD, C.H. Polman, MD PhD, G.J. Lycklama à Nijeholt, MD PhD, J.A. Castelijns, MD PhD, P. van der Valk, MD PhD and F. Barkhof, MD PhD

From the Dutch MR-MS Center and Departments of Radiology (Drs. Bergers, Bot, Lycklama à Nijeholt, Castelijns, and Barkhof), Pathology (Drs. De Groot and van der Valk), and Neurology (Dr. Polman), VU University Medical Center, Amsterdam, the Netherlands.

Address correspondence and reprint requests to Dr. E. Bergers, VU University Medical Center, Dept. of Radiology, De Boelenlaan 1117, 1081 HV Amsterdam, the Netherlands; e-mail: e.bergers{at}vumc.nl

Objective: To determine the degree of axonal damage in relationship to signal abnormalities on T2-weighted high-resolution MRI in spinal cord tissue of patients with MS.

Methods: Spinal cord specimens of nine patients with MS and four controls were imaged at high resolution (4.7 T) in an axial plane and scored for lesions with increased signal intensity (SI). Histopathologic sections were cut and immunostained with NE14 (neurofilament marker) and Luxol fast blue (myelin stain). For each area, axonal density and diameter were quantified; axonal irregularity, NE14 axonal staining intensity, and myelin content were semiquantitatively scored. Included were 209 areas from MS cases and 109 areas from control cases distributed over lateral, posterior, and anterior columns.

Results: In control cases, no SI changes were found, average density of axons was 26,989/mm2, average diameter was 1.1 µm, and all scores for axonal irregularity, NE14 staining intensity, and myelin were normal. In MS cases, areas with increased SI were found, average axonal density was 11,807/mm2 (p < 0.0001), and average axonal diameter 2.0 µm (p = 0.001). Areas with high SI on MRI had lowest axonal density (average count: 10,504/mm2; range: 3,433 to 26,325/mm2), largest diameter (average: 2.3 µm; range: 1.0 to 4.0 µm), and highest axonal irregularity and NE14 staining intensity compared to normal appearing cord tissue (NACT). However, NACT of MS cases also had lower axonal density (14,158/mm2) and higher average axonal diameter (1.6 µm) than controls.

Conclusions: Marked axonal loss occurs in MS spinal cords, largely independent of the degree of signal abnormality on T2-weighted MRI.




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