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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 27:995-997, May 2006
© 2006 American Society of Neuroradiology

Case Report
SPINE

Gadolinium Enhancement of Cauda Equina: A New MR Imaging Finding in the Radiculitic Form of Tick-Borne Encephalitis

S. Marjelund^a, A. Jaaskelainen^b, T. Tikkakoski^c, S. Tuisku^d and O. Vapalahti^b

^a Department of Radiology, Oulu University Central Hospital, Oulu, Finland
^b Haartman Institute, Helsinki University, Helsinki, Finland
^c Department of Radiology, Keski-Pohjanmaa Central Hospital, Kokkola, Finland
^d Department of Neurology, Keski-Pohjanmaa Central Hospital, Kokkola, Finland

Address correspondence to Sari Marjelund, MD, Department of Radiology, Oulu University Central Hospital, PL 50, FIN-90029 OYS, Oulu, Finland

SUMMARY: Tick-borne encephalitis virus is an important human pathogen in Europe. The infection usually presents as meningitis, meningoencephalitis, or meningoencephalomyelitis and only rarely as symptoms of isolated myeloradiculitis. We describe the lumbar MR imaging finding in a 48-year-old man with serologically confirmed tick-borne encephalitis in which there was enhancement of the ventral surface of the conus and the anterior nerve roots from the T12 level extending along the length of the ventral cauda.