Observer Variation in MRI Evaluation of Patients Suspected of Lumbar Disk Herniation
Jeroen C. van Rijn1,
Nina Klemetsö2,
Johannes B. Reitsma1,
Charles B. L. M. Majoie2,
Frans J. Hulsmans2,
Wilco C. Peul3,
Jan Stam4,
Patrick M. Bossuyt1 and
Gerard J. den Heeten2
1 Department of Clinical Epidemiology and Biostatistics, Academic Medical
Center, University of Amsterdam, Meibergdreef 9, Amsterdam 1105AZ, The
Netherlands.
2 Department of Radiology, Academic Medical Center, University of Amsterdam,
Amsterdam 1105AZ, The Netherlands.
3 Department of Neurosurgery, Leiden University Medical Center, Leiden 2333ZA,
The Netherlands.
4 Department of Neurology, Academic Medical Center, University of Amsterdam,
Amsterdam 1105AZ, The Netherlands.

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Fig. 1A. 60-year-old man with right-sided lumbosacral radicular
syndrome at level L5S1. Sagittal spin-echo unenhanced T1-weighted MR
image (TR/TE, 500/14) shows foraminal herniation of L4L5 disk. Arrow
indicates left-sided nerve root L4, reported as "possibly no root
compression" by one interpreter.
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Fig. 1B. 60-year-old man with right-sided lumbosacral radicular
syndrome at level L5S1. Axial spin-echo T1-weighted MR image (520/12)
shows right-sided nerve root S1 (arrow), reported as
"indeterminate" by both interpreters.
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Fig. 2. 42-year-old man with left-sided lumbosacral radicular
syndrome at level L4L5. Axial spin-echo unenhanced T1-weighted MR image
(TR/TE, 520/12) shows right-sided paramedian herniation of L4L5 disk.
Arrow indicates right-sided nerve root L5, reported as "possibly root
compression" by both interpreters.
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Copyright © 2005 by the American Roentgen Ray Society.