title: MRI in the diagnosis of sporadic Creutzfeldt-Jakob disease: a study on inter-observer agreement.
abstract: According to the current WHO criteria, technical investigations included in the clinical diagnosis of sporadic Creutzfeldt-Jakob disease (sCJD) are electroencephalogram (EEG) and CSF-analysis for 14-3-3 proteins. MRI is not a criterion for the diagnosis of sCJD, although typical changes have been described. We investigated the reliability of MRI in the sCJD diagnosis, evaluated MRI sequences and compared MRI with EEG and 14-3-3. This study includes 193 consecutive suspected sCJD patients who had been referred to the German CJD Surveillance Unit from 2001 to 2003. Three observers independently analysed MRI scans, blinded to clinical data. MRI was rated as 'typical for sCJD' if increased signal intensity was detected in the caudate nucleus and putamen. We analysed 442 MRI scans [184 T2-weighted sequences, 132 fluid attenuated inversion recovery (FLAIR) sequences, 75 diffusion-weighted sequences and 51 proton-density weighted sequences]. Inter-observer agreement was 123 of 193 patients or 63.7% (overall kappa = 0.53). Sensitivity of MRI in clinically probable or autopsy-proven sCJD was 59.7% for Observer 1, 58.3% for Observer 2 and 70.8% for Observer 3; specificity was high (84.2, 89.5 and 81.6%, respectively). Diffusion-weighted sequences best showed the pathologic changes, followed by FLAIR. Periodic sharp and slow wave complexes were detected in the EEG in 32% (sensitivity), the 14-3-3 proteins in CSF were elevated in 91%. We conclude that the detection of hyperintense basal ganglia in MRI helps to improve the clinical diagnosis, and therefore, we propose to incorporate MRI in the diagnostic criteria for sCJD.
authors.affiliation: Department of Radiology, University of Bonn, Sigmund-Freud-Strasse 25, D-53105 Bonn, Germany. Henriette.Tschampa@ukb.uni-bonn.de
authors.forename: Henriette J
authors.initials: HJ
authors.lastname: Tschampa
authors.forename: Kai
authors.initials: K
authors.lastname: Kallenberg
authors.forename: Horst
authors.initials: H
authors.lastname: Urbach
authors.forename: Bettina
authors.initials: B
authors.lastname: Meissner
authors.forename: Claudia
authors.initials: C
authors.lastname: Nicolay
authors.forename: Hans A
authors.initials: HA
authors.lastname: Kretzschmar
authors.forename: Michael
authors.initials: M
authors.lastname: Knauth
authors.forename: Inga
authors.initials: I
authors.lastname: Zerr
mesh_terms: D048948:14-3-3 Proteins / Q000134:cerebrospinal fluid; D015415:Biomarkers / Q000134:cerebrospinal fluid; D007562:Creutzfeldt-Jakob Syndrome / Q000175:diagnosis*; D004569:Electroencephalography; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D015588:Observer Variation; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity
chemical_list: D048948:14-3-3 Proteins; D015415:Biomarkers; C482982:YWHAB protein, human