- Case report
- Open Access
- Open Peer Review
Symptomatic aggravation after corticosteroid pulse therapy in definite sporadic Creutzfeldt-Jakob disease with the feature of Hashimoto's encephalopathy
© Jang et al. licensee BioMed Central Ltd. 2014
- Received: 21 August 2013
- Accepted: 3 September 2014
- Published: 8 September 2014
Creutzfeldt-Jakob disease and Hashimoto's encephalopathy often show similar clinical presentation. Among Creutzfeldt-Jakob disease mimics, Hashimoto's encephalopathy is particularly important as it is treatable with corticosteroids. Thus, in cases of middle-aged woman diagnosed with probable Creutzfeldt-Jakob disease and who exhibit high titers of antithyroid antibodies, corticosteroid pulse therapy is typically performed with expectations of near complete recovery from Hashimoto's encephalopathy. Herein, we provide the first case report that exhibited a negative effect of corticosteroid pulse therapy for a patient with Creutzfeldt-Jakob disease with features of Hashimoto's encephalopathy.
We report a case of 59-year-old Asian woman with blurred vision, dysarthria, myoclonus, and rapidly progressive dementia. Cerebrospinal fluid showed 14-3-3 protein positive. Electroencephalogram showed periodic sharp waves (1.5 Hz) at the bilateral frontal or occipital areas. Magnetic resonance imaging showed high signal intensities at the bilateral cerebral cortex, caudate nucleus, and putamen. The patient was diagnosed with probable Creutzfeldt-Jakob disease. However, serum analysis showed a high titer of antithyroid antibodies. We started corticosteroid pulse therapy with subsequent aggravation of seizure activity including generalized myoclonus, epilepsia parialis continua, and ballistic dyskinesia, which was effectively treated with clonazepam.
We provide evidence of a case of Creutzfeldt-Jakob disease that exhibited clinical deterioration after corticosteroid therapy. Although histopathological confirmation with brain biopsy is not easily available in Creutzfeldt-Jakob disease patients, selective initiation of corticosteroid pulse therapy should be considered in cases of uncertain diagnosis for differentiation with Hashimoto's encephalopathy.
- Creutzfeldt-Jakob disease
- Hashimoto's encephalopathy
Creutzfeldt-Jakob disease (CJD) is fatal prion disease characterized by rapidly progressive dementia, myoclonus, pyramidal and extrapyramidal signs, visual field defect, and cerebellar symptoms . Hashimoto's encephalopathy is corticosteroid-responsive autoimmune encephalitis with antithyroid antibodies that may have overlapping clinical symptoms with CJD, especially in the early phase of disease . Hashimoto's encephalopathy is more common in female individuals, typically presenting in middle age with a fluctuating encephalopathy including rapid progressing dementia, seizure, psychiatric manifestations, myoclonus, ataxia, stroke-like episodes, and coma, although the clinical phenotype is variable . Cerebrospinal fluid (CSF), electroencephalogram (EEG), and brain magnetic resonance imaging (MRI) findings are non-specific, and CJD diagnosis is based on an appropriate clinical phenotype with exclusion of other conditions, in addition to raised anti-thyroid antibodies (Tg-Ab and TPO-Ab). However, anti-thyroid antibodies are not specific to Hashimoto’s encephalopathy and are common in healthy elderly people . There is no obvious correlation between antibody levels and disease severity, and it is likely that the antibodies are not pathogenic but simply an epiphenomenon reflecting an underlying autoimmune inflammatory state . Thus, it is widely considered that Hashimoto’s encephalopathy should be relabeled as `corticosteroid-responsive encephalopathy associated with autoimmune thyroiditis' , and that lack of such corticosteroid response should prompt review of diagnosis . Among CJD mimics, Hashimoto’s encephalopathy is particularly important as it is treatable with corticosteroids . In our thorough review of the literature on CJD mimicking Hashimoto’s encephalopathy or Hashimoto’s encephalopathy mimicking CJD, we found no evidence of definite markers for differential diagnosis of CJD and Hashimoto’s encephalopathy ,-. Here, we describe a case of a patient with definite CJD with high titers of anti-thyroid antibodies whose clinical symptom was aggravated as a dominant seizure after initiation of corticosteroid pulse therapy.
A 59-year-old woman was admitted because of blurred vision, dysarthria, myoclonic movement of bilateral upper and lower limbs, and rapidly progressive dementia. The symptoms had started approximately 1 month prior and progression was so rapid that she became akinetic and occasionally showed just a slight smile as a response to questioning over the last 2 weeks.
Previously reported cases with the feature of CJD and HE in need of differential diagnosis
Hashimoto encephalopathy work-up
2004/Cho et al..
Bilateral frontal SWC (0.5-2 Hz)
MRI (DWI): HSI at cortex, caudate nucleus, putamen
US: Chronic thyroiditis
Dementia, parkinsonism, visual symptom, ataxia, myoclonus, akinetic mutism
SPECT/PET: Rt. Hemisphere: ↓
FNA: PMN, lymphocyte
2003/Cossu et al..
Periodic triphasic wave
Biopsy: typical CJD pattern, PRNP + codon 210, 129
Visual symptom, ataxia, myoclonus, mental change
TSH : ↑
T3, T4 : WNL
2012/Kondziella et al. .
Anti-thyroid antibody (+)
Dementia, ataxia, myoclonus
2008/Cerqueira et al..
Occasional sharp waves (2-3 Hz)
MRI (T2WI): HSI at corona radiata, centrum semiovale
T3, T4: WNL
Cognitive decline, insomnia, poor appetite, visual hallucination, tremor, gait disturbance, decreased mentality, myoclonus
2002/Doherty et al..
Bihemispheric slowing, triphasic wave
MRI (T2WI): HIS at Lt. medial frontal region
Biopsy: spongiform change
US: hypoechoic area
Generalized seizure, hallucination
2004/Vander et al..
Slow background, generalized delta activity
Confusion, myoclonus, bilateral hyperreflexia, babinski (+) generalized seizure
2011/Santoro et al..
Slow theta and delta waves
MRI (DWI, T2WI): HSI at left white matter and bilateral cortical region
Confusion, GTC, fluctuating alertness, myoclonic jerks
2004/Sakuria et al..
Diffuse slowing, periodic synchronous discharge
MRI (T2WI): HSI at periventricular and basal ganglia lesion
Dementia, gait, inactivity, myoclonus
TSH-receptor AB: ↑
TSH-receptor AB: ↑
What was unique in our patient is that her myoclonic seizure was distinctly aggravated as epilepsia partialis continua and secondary generalized tonic clonic seizure just after initiation of coritcosteroid pulse therapy. The semiology of her seizure was composed of mostly multifocal myoclonic movement, epilepsia partialis continua, and ballistic dyskinesia, which showed obvious improvement by clonazepam in addition to other anti-epileptic drugs. The response to clonazepam was so marked that an elevation of only 0.25 mg decreased her mentality with subsequent improvement of myoclonic jerk.
To our knowledge, an aggravated seizure just after initiation of corticosteroid pulse therapy in definite CJD has not been previously reported. Although our case was in a course of deterioration, there was clear temporal correlation with the initiation of corticosteroid pulse and abrupt increase in seizure activity. From both acute and chronic models of epilepsy, there is evidence that high corticosteroid levels may exacerbate seizure occurrence ,. Nevertheless, the symptomatology of our patient cannot be fully explained.
Focal motor or generalized seizures have been reported in 15-21% of patients with CJD during the later stage of the disease . However, seizures as the presenting symptom of CJD are uncommon and occur in only approximately 3% of cases . Based on five case reports in the literature, epilepsia partialis continua is reported as a presenting feature of CJD, although none of those cases were related to corticosteroid pulse therapy. The irritative, rather than destructive, nature of the cerebral damage may be the cause of the continuous jerks , while the loss of basal ganglia influence on the brain stem can also cause muscular twitches . Our patient also showed ballistic movement, which was reduced by clonazepam treatment. Coexistence of generalized chorea and epilepsia partialis continua as the initial signs was previously reported in probable CJD, although the movement disorder typically appears during the later disease stage .
This is the first definite case of CJD with symptomatic aggravation after corticosteroid pulse therapy for differential diagnosis with Hashimoto’s encephalopathy. In our patient, the high titer of anti-thyroid antibodies may have been an incidental finding, as the thyroid sonography was normal and brain biopsy confirmed final diagnosis as sporadic CJD that was abruptly aggravated by corticosteroids. When a middle-aged woman diagnosed with probable CJD shows a high titer of anti-thyroid antibodies, corticosteroid treatment is typically used as histopathological confirmation with brain biopsy is not easily available, with expectations of near complete recovery in cases of Hashimoto’s encephalopathy. However, if corticosteroid pulse therapy can cause rapid deterioration or seizure aggravation of CJD, the use of corticosteroids in probable CJD patients with high titers of anti-thyroid antibodies should be cautioned. Our patient showed very typical clinical symptoms, and EEG, MRI and CSF findings (14-3-3 protein) of CJD. Thus, it may be reasonable to selectively start corticosteroid pulse therapy in cases of uncertain diagnosis. If seizures are aggravated by corticosteroid treatment, clonazepam may be a good choice to reduce myoclonic jerk, in addition to anti-epileptic drugs. Further studies are required to prove a correlation between corticosteroid treatment and symptomatic aggravation of CJD.
Written informed consent was obtained from the caregiver of our patient for publication of this Case report and any accompanying images. A copy of the written consent is available for review by the Editor of this journal.
We thank the family of the patient presented here, whose help made this work possible.
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