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Hayashi Y. Pathological examination is required for the case of rapidly progressive dementia with only positive result of RT-QUIC assay. Prion 2017; 11:469-470. [PMID: 29095104 DOI: 10.1080/19336896.2017.1398879] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Affiliation(s)
- Yuichi Hayashi
- a Department of Neurology and Geriatrics , Gifu University Graduate School of Medicine , Gifu , Japan
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Hayashi Y, Iwasaki Y, Yoshikura N, Asano T, Mimuro M, Kimura A, Satoh K, Kitamoto T, Yoshida M, Inuzuka T. An autopsy-verified case of steroid-responsive encephalopathy with convulsion and a false-positive result from the real-time quaking-induced conversion assay. Prion 2017; 11:284-292. [PMID: 28749249 DOI: 10.1080/19336896.2017.1345416] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
We report an autopsy-verified case of steroid-responsive encephalopathy with convulsion and a false-positive result from the real-time quaking-induced conversion (RT-QUIC) assay. A 61-year-old Japanese man presented with acute onset of consciousness disturbance, and convulsions, but without a past medical or family history of progressive dementia, epilepsy, or prion disease. Brain diffusion and fluid-attenuated inverted recovery MR images revealed edematous cortical hyper-intensity, which diminished after the acute phase. Steroid pulse therapy was partially effective, although he continued to have dementia with myoclonus and psychiatric symptoms, despite resolution of the consciousness disturbance. Cerebrospinal fluid (CSF) analysis revealed a normal cell count, with significantly elevated levels of 14-3-3 protein and total tau protein. In addition, prion protein in the CSF was slowly amplified by the RT-QUIC assay. PRNP gene analysis revealed methionine homozygosity at codon 129 without mutation. The patient died of sudden cardiac arrest at 3 months after the onset of symptoms. The positive result from the RT-QUIC assay led us to suspect involvement of prion disease, although a postmortem assessment revealed that he had pathological changes after convulsion, and no prion disease. This case indicates that convulsion may cause false-positive RT-QUIC results, and that a postmortem evaluation remains the gold standard for diagnosing similar cases.
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Affiliation(s)
- Yuichi Hayashi
- a Department of Neurology and Geriatrics , Gifu University Graduate School of Medicine , Gifu , Japan
| | - Yasushi Iwasaki
- b Department of Neuropathology , Institute for Medical Science of Aging, Aichi Medical University , Nagakute , Japan
| | - Nobuaki Yoshikura
- a Department of Neurology and Geriatrics , Gifu University Graduate School of Medicine , Gifu , Japan
| | - Takahiko Asano
- c Department of Radiology , Gifu University Graduate School of Medicine , Gifu , Japan
| | - Maya Mimuro
- b Department of Neuropathology , Institute for Medical Science of Aging, Aichi Medical University , Nagakute , Japan
| | - Akio Kimura
- a Department of Neurology and Geriatrics , Gifu University Graduate School of Medicine , Gifu , Japan
| | - Katsuya Satoh
- d Department of Locomotive Rehabilitation Sciences , Nagasaki University Graduate School of Medicine , Nagasaki , Japan
| | - Tetsuyuki Kitamoto
- e Division of CJD Science and Technology, Department of Prion Research , Center for Translational and Advanced Animal Research on Human Diseases, Tohoku University School of Medicine , Sendai , Japan
| | - Mari Yoshida
- b Department of Neuropathology , Institute for Medical Science of Aging, Aichi Medical University , Nagakute , Japan
| | - Takashi Inuzuka
- a Department of Neurology and Geriatrics , Gifu University Graduate School of Medicine , Gifu , Japan
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Hayashi Y, Inuzuka T. A multidisciplinary medical network approach is crucial for increasing the number of autopsies for prion disease [Reply to: How can we increase the numbers of autopsies for prion disease? A model system in Japan]. J Neurol Sci 2017; 377:95-96. [PMID: 28477717 DOI: 10.1016/j.jns.2017.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 04/05/2017] [Indexed: 11/19/2022]
Affiliation(s)
- Yuichi Hayashi
- Department of Neurology and Geriatrics, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan.
| | - Takashi Inuzuka
- Department of Neurology and Geriatrics, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan
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