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December 2022; 12 (6) Review

Clinical Profile and Outcomes of COVID-19–Associated Transverse Myelitis

A Case Report and Review of Literature

Aashrai Gudlavalleti, Avindra Nath
First published October 12, 2022, DOI: https://doi.org/10.1212/CPJ.0000000000200094
Aashrai Gudlavalleti
Department of Neurology (AG), OhioHealth, Marion, OH; and National Institute of Neurological Disorders and Stroke (AN), National Institutes of Health, Bethesda, MD.
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Avindra Nath
Department of Neurology (AG), OhioHealth, Marion, OH; and National Institute of Neurological Disorders and Stroke (AN), National Institutes of Health, Bethesda, MD.
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Clinical Profile and Outcomes of COVID-19–Associated Transverse Myelitis
A Case Report and Review of Literature
Aashrai Gudlavalleti, Avindra Nath
Neurol Clin Pract Dec 2022, 12 (6) e221-e227; DOI: 10.1212/CPJ.0000000000200094

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Abstract

Purpose of Review The purpose of this study was to evaluate demographics, clinical profiles, and outcomes of transverse myelitis (TM) in the setting of COVID-19 infection (iTM) or vaccination (vTM) and to describe a case of spontaneous resolution of iTM.

Recent Findings Of a total of 158 articles that met our search criteria, 30 articles detailing 65 unique cases were included, of which 48 (73.8%) were iTM and 17 (26.2%) were vTM. The mean age of the iTM group was significantly lower as compared with vTM (43 ± 20.3 years vs 56.4 ± 18.6 years; p = 0.02). There were no gender differences between the groups. There were no significant differences in time to symptom onset (9.9 ± 14.3 days in iTM vs 7.6 ± 7.0 days in vTM, p = 0.2) between the groups. There were no significant differences between iTM and vTM in imaging features or laboratory abnormalities. The most common pharmacotherapy that was administered was intravenous (i.v.) corticosteroid (n = 56, 87.5%), followed by oral corticosteroids (n = 20, 31.2%), plasmapheresis (n = 19, 29.7%), and intravenous immunoglobulin (n = 14, 21.9%). Most of the cases reported a good outcome (n = 51, 79.7%) with no significant differences between the groups (77.1% in iTM vs 87.5% in vTM; p = 0.37).

Summary There are no significant differences with respect to time to presentation, clinical and radiological features, and in outcomes between iTM and vTM, suggesting a common pathogenesis. Approximately 80% of cases have a good outcome. Hence, early recognition and treatment are important. Our case demonstrates that treatment should be based on the clinical presentation rather than laboratory or imaging features.

Embedded Image

Transverse myelitis (TM) is an inflammatory condition affecting the spinal cord and often presents with rapid onset of bilateral focal neurologic signs including motor, sensory, and bladder/bowel dysfunction. Clinically, it may be a complete or partial transaction of the spinal cord, and if it involves more than 3 segments, it is called longitudinally extensive. It may occur as part of a continuum of other neuroimmune disorders such as multiple sclerosis (MS), neuromyelitis optica, acute disseminated encephalomyelitis, and neurosarcoidosis. Systemic immune disorders have also been associated with TM. Several infections can also trigger a TM, which presents as a postinfectious syndrome.1 Direct viral infection of the spinal cord is rare, but has been shown with poliovirus and rabies, and is suspected to also occur with other enteroviruses and arboviruses where there is preferentially gray matter involvement of the spinal cord, implying neuronal spread.

Since the start of the COVID-19 pandemic more than 2 years ago, numerous neurologic manifestations of the infections have emerged in the literature. The prevalence of neurologic disorders associated with COVID-19 infection has been estimated to be approximately 35–85% in the acute and subacute phases. One of the less common but devastating neurologic complications of COVID-19 has been TM.2 Numerous theories regarding the same have been proposed, including direct neuronal injury by the virus and a host hyperinflammatory response.3 In addition, during the pandemic, parainfectious TM arising from COVID-19 vaccinations has also been noticed.3 Although most reported cases of COVID-19 infection–associated TM (iTM) and COVID-19 vaccine–associated TM (vTM) have been treated with immunotherapy with a positive clinical outcome,4,-,7 there remains a paucity of data regarding the pathophysiology, clinical presentation, and best course of management for iTM and vTM. We illustrate this by presenting a case of iTM with spontaneous resolution without any immunosuppressive therapy. We also discuss a brief review of the literature on demographics, clinical features, and outcomes of cases with iTM and vTM since the start of the pandemic.

Methods

Case Report

Informed consent was obtained from the patient to present our case report. CARE 2020 guidelines for case reports were adhered to. ENTREQ guidelines were adhered to for the literature review.

Literature Review

A review of the published literature in PubMed was conducted between January 10, 2017, and January 10, 2022, using the search words: “covid 19” and “transverse myelitis.” Studies were selected if they had at least one reported case of TM in an individual with a recent history of COVID infection or vaccination. Cases with alternate causes of TM such as MS, neuromyelitis optica spectrum disorders (NMOSDs), and antimyelin oligodendrocyte glycoprotein (MOG) disorder were excluded. Cases with uncertain diagnoses or alternate diagnoses of myeloradiculoneuropathy and encephalomyelitis were excluded as well. The exclusion was done on a case-by-case basis. Thus, a single published case series could have a case that was included but another case that was excluded. If 2 or more studies described the same case, the case from only one study was included. STATA 14.0 was used for statistical analysis. Frequency tabulation, chi-square test, and unpaired t-test were used for included cases when appropriate. If information was not available regarding a specific variable, the case in question was excluded from the comparative analysis between groups (iTM and vTM).

Case Report

A 68-year-old woman with no pertinent medical history developed bilateral lower extremity weakness, numbness, and tingling. These symptoms evolved over a period of one day. She was diagnosed with COVID-19 based on a SARS-CoV-2 PCR-positive test 19 days before the onset of neurologic symptoms, at which time she was asymptomatic. PCR testing was performed because she was a contact of a confirmed patient. At the time of presentation, she had a normal mental status and cranial nerve examination, intact strength (Medical Research Council grade 5) in both upper extremities, weakness in the proximal muscles of both lower extremities (iliopsoas and quadriceps Medical Research Council grade 4+), and reduced pain sensation in the entire right lower extremity with no clear sensory level. Deep tendon reflexes were normal in the upper extremities. The knee jerks were hyperreflexic, and plantar responses were upgoing on both sides.

Blood tests showed a normal metabolic panel and complete blood cell count. Cell-based assays for antibodies to MOG and aquaporin-4 (neuromyelitis optica) were normal. Brain MRI with and without contrast was normal. However, MRI of the cervical and thoracic spine with and without contrast showed a nonenhancing patchy abnormality on T2/STIR (Short Tau Inversion Recovery) sequences extending from C1 through T10 levels, predominantly sparing the gray matter. The image is shown in Figure 1. Lumbar puncture was slightly traumatic.

Figure 1
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Figure 1 MRI of the Thoracic Spine

An T2 axial and sagittal section of the thoracic spinal cord with and without contrast shows a high signal intensity lesion through C1-10 levels sparing the gray matter.

Opening pressure was normal (13 cm H20). CSF showed lymphocytic pleocytosis (27 white blood cells with 7 red blood cells/mm3, 79% lymphocytes), elevated protein (120 mg/dL), and borderline low glucose (50 mg/dL). Oligoclonal bands were absent. The patient elected to defer immunosuppressive therapy because she felt that the symptoms were relatively mild. Evaluation 3 months later showed improvement in strength and sensation. A repeat MRI of the cervical and thoracic spine with and without contrast showed near-complete interval resolution of the T2/STIR abnormalities.

Results of the Literature Review

The search was conducted between January 10, 2017, and January 10, 2022, and resulted in 158 articles. Of these, 78 articles describing 138 cases of relevance, i.e., articles containing descriptions of cases with TM associated with COVID-19 infection or vaccination, were selected. Of these articles, 50 (78 cases) were excluded because of either uncertain diagnoses or an alternative diagnosis of MS, NMOSDs, anti-MOG disorder, encephalomyelitis, or myeloradiculoneuropathy. In the final review, 30 studies detailing 65 unique cases were included.3,-,32 The search strategy is detailed in Figure 2. The selected studies are summarized in eTable 1 (links.lww.com/CPJ/A380).

Figure 2
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Figure 2 Search Strategy for Literature Review

Of a total of 158 articles, our search strategy resulted in a total of 30 studies (65 unique cases), which were included in the analyses.

Of a total of 65 included cases, 48 (73.8%) were iTM and 17 (26.2%) were vTM. The mean age (±SD) of all cases was 46.5 ± 20.6 years. The mean age of the iTM group was significantly lower as compared with that of vTM (43 ± 20.3 years vs 56.4 ± 18.6 years; p = 0.02). There was no statistically significant difference in the sex composition between the 2 groups (55.3% males in the iTM group vs 58.8% males in the vTM group, p = 0.74). Table 1 summarizes cases reported with COVID-19 vaccination. Of a total of 17 cases of vTM, 6 cases (35.3%) were associated with ChAdOx1 nCov-19 (AstraZeneca); 4 cases (23.5%) each with BNT162b2 (Pfizer) and mRNA-1273 (Moderna); and 1 case (5.9%) each with Ad26.COV2.S (Johnson and Johnson), BBIBP-CorV (Sinopharm), and CoronaVAC. A comparison of clinical, radiographic and laboratory features between iTM and vTM is given in Table 2. There was no statistically significant difference in clinical, imaging, or laboratory features between the groups.

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Table 1

Vaccines Associated With vTM

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Table 2

Clinical, Imaging, and Laboratory Features

Duration After Infection/Vaccination

TM occurred after 9.9 ± 14.3 days (mean ± SD) after infection and 7.6 ± 7.0 days after vaccination. There was no difference between the groups.

MRI Findings

In iTM, the most common site of involvement was both cervical and thoracic spines (42.6%), followed by the thoracic spine (38.3%). In vTM, the most common site of involvement was the thoracic spine (47.1%), followed by both cervical and thoracic spines (29.4%).

Longitudinally extensive TM (LETM) occurred in 82.9% of iTM cases vs 62.5% of vTM cases. Contrast enhancement was present in 34% of cases of iTM as compared with approximately 59% of cases in vTM. There was no statistical difference between the 2 groups.

Laboratory Testing

CSF abnormalities were found in 75% of the cases (n = 48), and serologic abnormalities were found in 35.5% of the cases in total. There was no significant difference in CSF abnormalities between iTM and vTM. Serologic abnormalities included the presence of SARS-CoV-2 IgG antibody, SSA antibody and GdM2/3 IgG antibody; abnormal CBC (anemia, lymphopenia and leukocytosis); SARS-CoV-2 PCR positive; elevated CRP, LDH, ferritin, IL-6, troponin T, ESR, and D dimer levels; low vitamin B12 and calcium levels. There was no difference in the frequency of serologic abnormalities between iTM and vTM.

Outcomes

Response to treatment was noted in 79.7% of the cases with a similar distribution among the subgroups of iTM and vTM. A comparison between outcomes and different clinical, radiologic, and laboratory factors is provided in Table 3. There was no difference in outcomes in iTM and vTM. Cases with lesions in the cervical spine were more likely to show improvement (77.1% showed improvement and 22.9% did not show an improvement, p = 0.048). Improvement did not seem to depend on whether the lesion was short-segment or LETM, whether the lesion was contrast-enhancing, or whether there were any abnormalities in the serum or CSF. Administration of intravenous corticosteroids was associated with improvement in 83.9%. Use of a combination of corticosteroids, IVIG, and PLEX was associated with a poor outcome, although there were only 2 such reported cases (100% showed no improvement, p = 0.004). This may represent a selection bias because combination therapy is usually reserved for severe cases.

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Table 3

Comparison of Outcomes

Discussion

A unique feature of our study is that we incorporated both COVID infection–related and COVID vaccine–related cases associated with TM. There was no significant difference in the interval between onset of symptoms and exposure to vaccination or to infection (Table 1) In both groups, the mean duration of onset was between 7 and 10 days. This suggests that TM may be a final common pathway of autoimmune inflammation, regardless of the nature of the triggering agent (COVID infection vs COVID vaccine).

TM associated with COVID infections presents a unique opportunity to learn about the natural history of TM from a confirmed viral/immunologic trigger to the development of clinical symptoms. A prior similar opportunity presented with the Zika virus epidemic, which also resulted in cases of TM.33 Case reports suggested onset of symptoms within 7–15 days of suspected infection.34,35 Similar patterns have also been reported with dengue infection and chikungunya virus.36,37

As hypothesized with TM associated with Zika virus infection, it is likely that iTM with COVID is a parainfectious presentation.33 Although direct infection could not be ruled out in cases with COVID infection–related TM, the significant improvement with immunosuppressive therapy (Table 2) and similar time delay between exposure and symptom onset between iTM and vTM suggests a parainfectious pathogenesis.

The type of vaccine administered did not seem to be associated with vTM. All the approved vaccines had cases where TM was reported. The higher incidence with ChAdOx1 nCoV-19, BNT162b, and mRNA-1273 as compared with CoronaVAC, Ad26.COV2.S, and BBIBP-CorV likely reflects the greater frequency of administration of the former 3 vaccines as compared with the latter 3. A detailed review of the vaccine administration data would be needed to determine whether a specific class of vaccines predisposes to vTM, similar to the analysis of Guillan-Barre syndrome and COVID-19 vaccination that was published by Hanson et al.38 in 2022, which suggested a higher risk with Johnson and Johnson vaccine as compared with the mRNA vaccines. Rare case reports of TM have also been reported after an influenza vaccine and a variety of other vaccinations.39,40 It is important to note that these complications are rare, and there are no distinguishing features between those associated with vaccinations or infections, suggesting similar pathophysiologic processes.

We also reviewed the VAERS (Vaccine Adverse Event Reporting System) data from the CDC, which showed a total of 290 cases of TM linked to COVID-19 vaccine administration in the United States until 5/13/2022, which were reported to the database.41 The vaccines administered included Johnson and Johnson, Pfizer, and Moderna. Pfizer and Moderna vaccines comprised approximately 75% of the cases, again likely reflecting an increased frequency of administration of these vaccines as compared with Johnson and Johnson. The VAERS relies on self-reporting, and hence, the data may not reflect the true incidence of vTM. Owing to the self-reporting nature, the data are usually incomplete from a clinical standpoint, and hence, the cases were not used for analysis in our study.

The CSF profile was abnormal in most cases of vTM and iTM. In cases where the CSF was abnormal (n = 48), the most common abnormality included elevated protein (81.2%), followed by lymphocytosis (47.9%). These findings are supportive of a viral/postviral etiology of TM. By contrast, serologic testing was normal in most cases. A similar finding was noted in our case as well. Our case showed extensive white matter involvement of the spinal cord with sparing of the gray matter. This pattern of spinal cord involvement has been poorly described in the literature.

However, enteroviruses such as polio virus and EV71 or EVD68 may predominantly affect the gray matter. This distinction may be important because demyelinating processes with white matter involvement may be suggestive of an immune-mediated process while gray matter involvement may suggest direct infection of the neurons. These cases often occur in children and have a more rapid onset with less than 10 days from the onset of infection. The term acute flaccid myelitis is often used to describe them because of the predominant anterior horn cell involvement, which leads to a flaccid paralysis.42

Analysis of the outcomes revealed improvement with treatment in approximately 80% of all cases, suggesting an optimistic prognosis. Treatment data were available for all cases, except one. Most cases received i.v. corticosteroids (87.5%), followed by oral corticosteroids, plasmapheresis, and IVIG (31.2%, 29.7%, and 21.9%, respectively). Most cases were treated with only one modality (corticosteroids/IVIG/plasmapheresis), possibly suggesting low severity or a favorable/rapid response. Cases requiring >2 modalities had a poorer outcome, reflecting the severity of the disease. Thus, early and aggressive treatment may be warranted even if the trigger is an infectious agent.

Our case is unique because it reflects resolution of iTM despite significant cord involvement. This likely suggests a transient parainfectious inflammation with COVID-19 infection without significant axonal/cytotoxic damage and complete resolution. Hence, clinical symptoms are likely a better indicator of prognosis rather than the degree or type of cord involvement, and all cases of iTM may not require treatment. Larger, prospective studies are required to enable physicians to prognosticate iTM cases and individualize therapy (supportive treatment vs immunomodulatory therapies).

Because TM is a rare manifestation that can be triggered by a wide variety of infections and immune conditions and has very similar clinical presentations no matter what the triggering event is, it suggests that the patients likely have a genetic susceptibility. In fact, rare familial cases of TM have been reported and a rare missense mutation in a gene VPS37A has been implicated.43 Hence, further genetic studies may be useful in these populations.

Our study has several limitations. SARS-CoV-2 PCR in the CSF was unavailable, and hence, a direct infection could not be confirmed in our case. However, given the temporal relationship of the patient's symptoms and recent COVID-19 infection, iTM is the most likely diagnosis. The patient did not receive any pharmacotherapy, and hence, it is difficult to ascertain whether the lesion present in the imaging would have resolved sooner with therapy. We only selected cases from one database (PubMed) for analysis and may have missed cases in other databases and those that have not been published. In addition, the possibility that they may have recovered spontaneously despite undergoing treatment cannot be completely excluded.

Study Funding

Supported in part by funds from the National Institute of Neurological Disorders and Stroke at the NIH (NS03130).

Disclosure

The authors report no disclosures relevant to the manuscript. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp.

Appendix Authors

Table

Footnotes

  • Funding information and disclosures are provided at the end of the article. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp.

  • ↵* Both authors contributed equally to this work.

  • Submitted and externally peer reviewed. The handling editor was Deputy Editor Kathryn Kvam, MD.

  • COVID-19 Resources: NPub.org/COVID19

  • Received June 10, 2022.
  • Accepted August 24, 2022.
  • © 2022 American Academy of Neurology

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