Correspondence

Rasmussen’s Encephalitis with Faciobrachial Dystonic Attacks and Bilateral Hemispheric Involvement Jian‑Hua Chen1, Li‑Ri Jin1, Xiao‑Hua Shi2, Di Yang2, Yi Guo3 Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China 3 Department of Neurosurgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China 1

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To the Editor: Rasmussen’s encephalitis (RE) is a rare but devastating unihemispheric brain disorder, usually affecting children and characterized by intractable seizures and progressive neurological deficits. [1] Characteristic magnetic resonance imaging (MRI) finding of RE is progressive unihemispheric focal cortical atrophy. Bilateral RE is very uncommon. Here, we report an RE patient with faciobrachial dystonic attacks and bilateral brain atrophy but without seizures. A 15‑year‑old boy presented with progressive left hemiparesis at Department of Neurology, Peking Union Medical College Hospital in November 2013, which appeared at the age of 13. One and a half years ago, the patient suffered from left arm weakness. Half a year later, he had weakness of left leg and slurred speech. The symptoms progressed gradually. Cerebrospinal fluid  (CSF) tests were normal. Fifteen months after onset, a 24‑h electroencephalography (EEG) was unremarkable, and brain MRI showed atrophy in the right insular cortex, caudate, putamen, and cerebral crus with high signals in the corona radiata on T2‑weighted and fluid‑attenuated inversion recovery images. Physical examination found dysphasia. Muscle tone in the left limbs was high, and strength was 4/5. Ankle clonus and Babinski sign were positive in the left side. Blood tests showed normal leukocyte and platelet counts. Liver and renal function and erythrosedimentation were normal. Anti‑neuronal antibodies and antibodies for herpes simplex virus, rubella virus, Cytomegalovirus, toxoplasma, and Epstein–Barr virus were negative. Repeated CSF analysis was normal. Voltage‑gated potassium channel complexes (VGKCs) including leucine‑rich glioma inactivated‑1 (LgI1) antibodies in serum and CSF were negative. In November 2013, MRI showed atrophy in the right hemisphere without contrast enhancement [Figure 1a]. Repeated EEG showed less sleep spindles and vertex sharp waves on right hemisphere without epileptiform potentials or persistent delta activity [Figure 1c and 1d]. Brain biopsy was recommended. Histological examinations revealed focal chronic inflammatory changes characterized by predominantly CD3+ T‑cells scattered in the parenchyma and clustered around small blood vessels with microglial activation. According to the diagnostic criteria in the 2005 European Consensus Statement,[1] RE was diagnosed, and intravenous immunoglobulins and methylprednisolone were Access this article online Quick Response Code:

Website: www.cmj.org

DOI: 10.4103/0366-6999.173554

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recommended, but the patient and his family refused due to economic reasons. During the follow‑up, the patient’s neurological deficits progressed, and he developed faciobrachial dystonic attacks 2 years later, which demonstrated as paroxysmal unilateral involuntary movements of the left arm and face, lasting about 5 min and occurring several times a day. He did not lose consciousness or drop during the attacks. In December 2014, repeated MRI demonstrated progressive right hemispheric atrophy, enlargement of bilateral frontal horn, and atrophy in the left insular, perisylvian cortex, and caudate [Figure 1b]. His neurological function declined during the initial 34 months. He had aphasia and spastic quadriplegia. Frequency of faciobrachial dystonic attacks increased to dozens of time. After that period, the patient passed into a stage with a stable neurological deficit. Since both imaging features and focal deficits implicated bilateral hemispheric involvement, he was diagnosed bilateral RE. There is debate about whether faciobrachial dystonic attacks were movement disorder or seizures.[2] Faciobrachial dystonic attacks were often seen in limbic encephalitis associated with positive VGKC/LgI1 antibodies.[3] In this case, the attacks were more likely movement disorder rather than seizures. No loss of consciousness or drop occurred during the attacks, and ictal EEG showed no epileptiform changes. The duration of the attacks lasted about 5 min, which was much more suggestive of hemidystonia, while faciobrachial dystonic seizures are very brief, usually lasting < 3 s.[4] Another feature of this case was that the neuroimaging showed predominant basal ganglia involvement with putaminal and caudate atrophy, which could explain the extrapyramidal manifestations such as dystonia and dysphasia. The faciobrachial dystonic attacks of the right arm and face might be associated with the prominent atrophy of the head of left caudate nucleus. Address for correspondence: Dr. Jian‑Hua Chen, Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China E‑Mail: [email protected] This is an open access article distributed under the terms of the Creative Commons Attribution‑NonCommercial‑ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non‑commercially, as long as the author is credited and the new creations are licensed under the identical terms. © 2016 Chinese Medical Journal  ¦  Produced by Wolters Kluwer ‑ Medknow

Received: 27‑08‑2015 Edited by: Xin Chen How to cite this article: Chen JH, Jin LR, Shi XH, Yang D, Guo Y. Rasmussen's Encephalitis with Faciobrachial Dystonic Attacks and Bilateral Hemispheric Involvement. Chin Med J 2016;129:248-9. Chinese Medical Journal  ¦  January 20, 2016  ¦  Volume 129  ¦  Issue 2

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 Figure  1: (a) Axial fluid‑attenuated inversion recovery images at 18 months after onset showed atrophy in the right caudate and putamen, high signals in the white matter. (b) Axial fluid‑attenuated inversion recovery at 32 months after onset demonstrated the progression of atrophy in the right caudate and putamen, progressive gliosis of the white matter. (c and d) Electroencephalography at 18 months after onset showed less and lower amplitude K‑complex and sleep spindles on right hemisphere during sleep. This case demonstrated that the manifestation of epilepsy can be timely dissociated from the inflammatory and degenerative features of RE,[5] confirming that seizures are not an obligatory presenting symptom of RE. Epilepsy might be relatively rare in RE presented with dystonia.

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Financial support and sponsorship Nil.

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References

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There are no conflicts of interest.

1. Bien CG, Granata T, Antozzi C, Cross JH, Dulac O, Kurthen M, et al. Pathogenesis, diagnosis and treatment of Rasmussen encephalitis: A

Chinese Medical Journal ¦ January 20, 2016  ¦  Volume 129  ¦  Issue 2

European consensus statement. Brain 2005;128(Pt 3):454‑71. doi: 10.1093/brain/awh415. Striano P. Faciobrachial dystonic attacks: Seizures or movement disorder? Ann Neurol 2011;70:179‑80. doi: 10.1002/ana.22470. Irani SR, Michell AW, Lang B, Pettingill P, Waters P, Johnson MR, et al. Faciobrachial dystonic seizures precede LgI1 antibody limbic encephalitis. Ann Neurol 2011;69:892‑900. doi: 10.1002/ ANA.22307. Maramattom BV, Jeevanagi SR, George C. Facio‑brachio‑ crural dystonic episodes and drop attacks due to leucine rich glioma inactivated 1 encephalitis in two elderly Indian women. Ann Indian Acad Neurol 2013;16:590‑2. doi: 10.4103/0972‑2327.120480. Ferrari TP, Hamad AP, Caboclo LO, Centeno RS, Zaninotto AL, Scattolin M, et al. Atypical presentation in Rasmussen encephalitis: Delayed late‑onset periodic epileptic spasms. Epileptic Disord 2011;13:321‑5. doi: 10.1684/epd.2011.0455.

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