West Nile virus infection: MR imaging findings in the nervous system
Identifieur interne : 000008 ( PascalFrancis/Curation ); précédent : 000007; suivant : 000009West Nile virus infection: MR imaging findings in the nervous system
Auteurs : Muhammad Ali [États-Unis] ; Yair Safriel [États-Unis] ; Jaideep Sohi [États-Unis] ; Alfred Llave [États-Unis] ; Susan Weathers [États-Unis]Source :
- American journal of neuroradiology [ 0195-6108 ] ; 2005.
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Abstract
BACKGROUND AND PURPOSE: West Nile virus (WNV) infection is an ongoing seasonal epidemic. We correlated the MR imaging findings with the clinical presentations and outcomes of WNV infection. METHODS: We reviewed 14 brain and three spinal MR images: nonenhanced and contrast-enhanced T1-weighted images (TlWIs) and T2-weighted images (T2WIs), nonenhanced fluid-attenuated inversion recovery (FLAIR) images (11 patients) and enhanced FLAIR images (three patients), with diffusion-weighted (DW) images and apparent diffusion coefficient maps. WNV infection was diagnosed by means of enzyme-linked immunosorbent assay with a plaque reduction neutralization test. We also correlated the MR findings with the clinical presentation, course, and outcome to determine their prognostic importance. RESULTS: MR imaging findings included: 1) normal (five patients); 2) DW imaging-only abnormalities in the white matter, corona radiata, and internal capsule (four patients); 3) hyperintensity on FLAIR images and T2WIs in the lobar gray and white matter, cerebellum, basal ganglia, thalamus and internal capsule, pons and midbrain (three patients); 4) meningeal involvement (two patients); and 5) spinal cord, cauda equina, and nerve root involvement (three patients). All patients with finding 1 and all but one with finding 2 recovered completely. Two patients with finding 3 died. Those with finding 4 or 5 had residual neurologic deficits that were severe or moderate to severe, respectively. CONCLUSION: Patients with normal MR images or abnormalities on only DW images had the best prognosis, while those with abnormal signal intensity on T2WI and FLAIR images had the worst outcomes. No definite predilection for any specific area of the brain parenchyma was noted.
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Sohi</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Merit Care Healthcare System), Medicine</s1><s2>Fargo, ND</s2><s3>USA</s3><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country></affiliation></author><author><name sortKey="Llave, Alfred" sort="Llave, Alfred" uniqKey="Llave A" first="Alfred" last="Llave">Alfred Llave</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Radiology, Baylor College Of Medicine</s1><s2>Houston, TX</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country></affiliation></author><author><name sortKey="Weathers, Susan" sort="Weathers, Susan" uniqKey="Weathers S" first="Susan" last="Weathers">Susan Weathers</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Radiology, Baylor College Of Medicine</s1><s2>Houston, TX</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 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sort="Safriel, Yair" uniqKey="Safriel Y" first="Yair" last="Safriel">Yair Safriel</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Department of Neuroradiology, Yale University School of Medicine</s1><s2>New Haven, CT</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country></affiliation></author><author><name sortKey="Sohi, Jaideep" sort="Sohi, Jaideep" uniqKey="Sohi J" first="Jaideep" last="Sohi">Jaideep Sohi</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Merit Care Healthcare System), Medicine</s1><s2>Fargo, ND</s2><s3>USA</s3><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country></affiliation></author><author><name sortKey="Llave, Alfred" sort="Llave, Alfred" uniqKey="Llave A" first="Alfred" last="Llave">Alfred Llave</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Radiology, Baylor College Of Medicine</s1><s2>Houston, TX</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country></affiliation></author><author><name sortKey="Weathers, Susan" sort="Weathers, Susan" uniqKey="Weathers S" first="Susan" last="Weathers">Susan Weathers</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Radiology, Baylor College Of Medicine</s1><s2>Houston, TX</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country></affiliation></author></analytic><series><title level="j" type="main">American journal of neuroradiology</title><title level="j" type="abbreviated">Am. j. neuroradiol.</title><idno type="ISSN">0195-6108</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">American journal of neuroradiology</title><title level="j" type="abbreviated">Am. j. neuroradiol.</title><idno type="ISSN">0195-6108</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Infection</term><term>Nervous system</term><term>Nervous system diseases</term><term>Nuclear magnetic resonance imaging</term><term>Radiodiagnosis</term><term>West</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Système nerveux pathologie</term><term>Radiodiagnostic</term><term>Ouest</term><term>Infection</term><term>Imagerie RMN</term><term>Système nerveux</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">BACKGROUND AND PURPOSE: West Nile virus (WNV) infection is an ongoing seasonal epidemic. We correlated the MR imaging findings with the clinical presentations and outcomes of WNV infection. METHODS: We reviewed 14 brain and three spinal MR images: nonenhanced and contrast-enhanced T1-weighted images (TlWIs) and T2-weighted images (T2WIs), nonenhanced fluid-attenuated inversion recovery (FLAIR) images (11 patients) and enhanced FLAIR images (three patients), with diffusion-weighted (DW) images and apparent diffusion coefficient maps. WNV infection was diagnosed by means of enzyme-linked immunosorbent assay with a plaque reduction neutralization test. We also correlated the MR findings with the clinical presentation, course, and outcome to determine their prognostic importance. RESULTS: MR imaging findings included: 1) normal (five patients); 2) DW imaging-only abnormalities in the white matter, corona radiata, and internal capsule (four patients); 3) hyperintensity on FLAIR images and T2WIs in the lobar gray and white matter, cerebellum, basal ganglia, thalamus and internal capsule, pons and midbrain (three patients); 4) meningeal involvement (two patients); and 5) spinal cord, cauda equina, and nerve root involvement (three patients). All patients with finding 1 and all but one with finding 2 recovered completely. Two patients with finding 3 died. Those with finding 4 or 5 had residual neurologic deficits that were severe or moderate to severe, respectively. CONCLUSION: Patients with normal MR images or abnormalities on only DW images had the best prognosis, while those with abnormal signal intensity on T2WI and FLAIR images had the worst outcomes. No definite predilection for any specific area of the brain parenchyma was noted.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0195-6108</s0></fA01><fA02 i1="01"><s0>AAJNDL</s0></fA02><fA03 i2="1"><s0>Am. j. neuroradiol.</s0></fA03><fA05><s2>26</s2></fA05><fA06><s2>2</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>West Nile virus infection: MR imaging findings in the nervous system</s1></fA08><fA11 i1="01" i2="1"><s1>ALI (Muhammad)</s1></fA11><fA11 i1="02" i2="1"><s1>SAFRIEL (Yair)</s1></fA11><fA11 i1="03" i2="1"><s1>SOHI (Jaideep)</s1></fA11><fA11 i1="04" i2="1"><s1>LLAVE (Alfred)</s1></fA11><fA11 i1="05" i2="1"><s1>WEATHERS (Susan)</s1></fA11><fA14 i1="01"><s1>Department of Radiology, Baylor College Of Medicine</s1><s2>Houston, TX</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></fA14><fA14 i1="02"><s1>Department of Neuroradiology, Yale University School of Medicine</s1><s2>New Haven, CT</s2><s3>USA</s3><sZ>2 aut.</sZ></fA14><fA14 i1="03"><s1>Merit Care Healthcare System), Medicine</s1><s2>Fargo, ND</s2><s3>USA</s3><sZ>3 aut.</sZ></fA14><fA20><s1>289-297</s1></fA20><fA21><s1>2005</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>19668</s2><s5>354000127052330140</s5></fA43><fA44><s0>0000</s0><s1>© 2005 INIST-CNRS. 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We also correlated the MR findings with the clinical presentation, course, and outcome to determine their prognostic importance. RESULTS: MR imaging findings included: 1) normal (five patients); 2) DW imaging-only abnormalities in the white matter, corona radiata, and internal capsule (four patients); 3) hyperintensity on FLAIR images and T2WIs in the lobar gray and white matter, cerebellum, basal ganglia, thalamus and internal capsule, pons and midbrain (three patients); 4) meningeal involvement (two patients); and 5) spinal cord, cauda equina, and nerve root involvement (three patients). All patients with finding 1 and all but one with finding 2 recovered completely. Two patients with finding 3 died. Those with finding 4 or 5 had residual neurologic deficits that were severe or moderate to severe, respectively. 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