Viral-induced intracranial hypertension mimicking pseudotumor cerebri

Post-acute sequelae of COVID infection and cerebral venous outflow disorders: Overlapping symptoms and mechanisms?

Neurological long Covid (NLC) is a major post-acute sequela of SARS-CoV-2 infection, affecting up to 10% of infected patients. The clinical presentation of patients with NLC is varied, but general NLC symptoms have been noted to closely mimic symptoms of cerebral venous outflow disorders (CVD). Here we review key literature and discuss evidence supporting this comparison. We also aimed to describe the similarity between CVD symptomatology and neuro-NLC symptoms from two perspectives: a Twitter-distributed survey for long covid sufferers to estimate nature and frequency of neurological symptoms, and through a small cohort of patients with long covid who underwent CVD work up per our standard workflow. Over 700 patients responded, and we argue that there is a close symptom overlap with those of CVD. CVD workup in a series of 6 patients with neurological long COVID symptoms showed jugular vein stenosis by CT venography and varying degrees of increased intracranial pressure. Finally, we discuss the potential pathogenic association between vascular inflammation, associated with COVID-19 infection, venous outflow congestion, and its potential involvement in NLC.

From Pseudotumor Cerebri to Neurobrucellosis: A Journey With Several Lessons

We present a case admitted for evaluation of suspected idiopathic intracranial hypertension (IIH) with an unusual but important departure from the expected algorithm. A 31-year-old lady came with a two-week duration of a mild headache and one-week duration of double vision with no previously documented fever or any comorbidities. Clinically, she had papilledema and bilateral abducens palsy with no signs of meningeal irritation. MRI brain radiology was consistent with IIH. Her CSF study showed pleocytosis with elevated protein levels and normal glucose. Serology was positive for Brucella melitensis at low titers but CSF culture grew Brucella melitensis, confirming the diagnosis of neurobrucellosis. Her headache and abducens palsy improved over the first two weeks, and the papilledema resolved over two months with antibiotics. This clinical mimic is important for physicians (including neurophysicians) and Infectious Disease specialists. The radiological mimic comes from chinked (small) ventricles, unlike most meningeal diseases which can present with papilledema and abducens palsy including tuberculosis, cryptococcosis, and leptomeningeal carcinomatosis. A CSF study is mandatory in the workup of IIH despite massive improvements in imaging.

Retrospective Observational Study Amidst Myriad Conundrums and Myths of Pediatric Headaches: A Critique on Diagnostics and Effectiveness of Interventions

Objective To study the etiological profile of pediatric headaches (PH) in a tertiary child neurology clinic and to determine the utility of diagnostics, interventions, and long-term prognosis. Methods Children (ages 4-15) observed over four years were recruited retrospectively. In primary headaches, the headache frequency and impact on quality of life (QOL) parameters at pre-treatment (T1) were compared post-treatment at follow-up (T2). Results Of the 311 eligible patients, 285 had primary headaches (Tension-Type Headache {TTH}: 156; Migraine: 129), and 26 had secondary headaches. The mean (±SD) onset age was 10 (±3) years with a male-to-female ratio of 2.3:1. Migraine was more common in children aged less than seven years (17/28) and TTH in older patients (146/283). The most common causes of secondary headache were intracranial hypertension (ICH) in 11/26 patients (four idiopathic intracranial hypertension (IIH), four following aseptic meningitis, three with cortical vein thrombosis), and ophthalmologic causes in 7/26 (of these five had convergence insufficiency). Hypertension was a rare cause of secondary headaches (2/26 patients). Neuroimaging was performed in 173/311 (56%), primarily for parental anxiety (160/173; 92%), and was abnormal in only four. At T2 (Median time to follow-up: 29 months; Interquartile range: 22-37 months), data were collected in 207/285 patients with primary headaches (TTH: 109; Migraine: 98). In both migraine and TTH groups, there were statistically significant reductions (p-value <0.0001) in headache frequency and QOL parameters. Conclusion In our study, TTH was the most common cause of PH. Neuroimaging was normal in most cases. Psychological interventions were effective but underutilized. The symptoms of primary headaches improved significantly over time, despite poor adherence to prophylactic medications.

Can Lumbar Puncture Be Safely Deferred in Patients With Mild Presumed Idiopathic Intracranial Hypertension?

BACKGROUND

Lumbar puncture (LP) is considered an essential component of the diagnosis of idiopathic intracranial hypertension (IIH) and ruling out IIH mimics, such as meningeal inflammation and neoplastic disease. Such mimics are unlikely in patients who are systemically well and fit the clinical demographic of IIH. It is important to take into account the risks of performing a LP as patients commonly experience mild adverse effects and infrequently more serious ones including psychological distress. LP can also be difficult to obtain in some health care settings, requiring inpatient admission. We examined the clinical course of a subset of presumed patients with IIH with mild vision loss and papilledema to determine whether LP can be safely deferred in this group.

METHODS

This was a retrospective study looking at the clinical characteristics, final visual outcome, and diagnosis of patients with presumed IIH and papilledema determined by clinical examination who did not undergo LP. The inclusion criteria included i) no symptoms suspicious for systemic infectious/neoplastic/inflammatory processes, ii) no secondary causes of raised intracranial pressure seen on magnetic resonance imaging/magnetic resonance venography, iii) optical coherence tomography (OCT)-RNFL thickness ≤300 µm, and iv) automated mean deviation (MD) ≤ -5.00 dB v) at least one follow-up visit.

RESULTS

A total of 132 eyes of 68 patients (66 female and 2 male) were included in the study. The mean ± SD age was 31.4 ± 10.2 years, and body mass index was 35.1 ± 6.8 kg/m 2 . Systemic symptoms included headache (n = 47), pulsatile tinnitus (n = 28), transient visual obscurations (n = 10), and diplopia (n = 2). Presenting logarithm of the minimum angle of resolution visual acuity was 0.020 ± 0.090, automated MD was -2.23 ± 1.38 dB, and OCT RNFL thickness was 150.8 ± 48.4 µm. Patients were followed for a mean number of 63.3 ± 78.3 weeks. No additional cause of intracranial hypertension was discovered, and all patients remained systemically well. Two patients were started on acetazolamide, and 31 patients lost at least some weight. There was a significant improvement in the automated MD (-1.73 ± 1.74 dB; P < 0.001) and OCT RNFL thickness (128.1 ± 38.6 µm; P < 0.001) at final follow-up. Seventy-six eyes of 38 patients were considered to have resolved papilledema at the final follow-up.

CONCLUSIONS

Some patients with presumed IIH may not be able to undergo LP because of patient factors such as refusal, failed attempts, or the environment in which neuro-ophthalmologists practice. This study suggests that it may be acceptable to defer LP for patients with suspected IIH who are under the care of a neuro-ophthalmologist with experience in diagnosing and managing IIH. These patients should be systemically well, in a typical demographic for IIH patients, have mild optic disc edema, and preserved visual function. Patients should be informed about the controversial nature of this decision.

The diagnostic dilemma of idiopathic intracranial hypertension in a child with acute lymphoblastic leukemia: COVID-19 or cytosine arabinoside?

Background

Idiopathic intracranial hypertension is a rare neurological condition among children. Its manifestations vary from mild headaches to loss of vision. Although rare, COVID-19 infection and high dose cytosine arabinoside have been reported as risk factors for this neurological disorder. In patients with acute leukemia, idiopathic intracranial hypertension diagnosis is simple, but finding its etiology can be difficult.

Case presentation

We report a case of a 9-year-old boy with an ongoing treatment for T-acute lymphoblastic leukemia presenting with persistent headaches and diplopia. A diagnosis of idiopathic intracranial hypertension was retained based on clinical, imaging and laboratory findings. Due to its rarity, we describe its clinical and therapeutic features and highlight the challenging etiological dilemma between COVID-19 infection and high dose cytosine arabinoside administration.

Conclusion

Persistent headache in a pediatric patient with leukemia can be due to many neurological disorders other than leukemic relapse. Given the improvement of the neurological symptoms after the SARS-CoV-2 PCR negativization and the successful re-introduction of high dose cytosine Arabinoside, the diagnosis of idiopathic intracranial hypertension associated with Covid-19 infection was withheld.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12883-022-02689-z.

Management of Idiopathic Intracranial Hypertension During the COVID-19 Pandemic

BACKGROUND

In the current coronavirus disease 2019 (COVID-19) pandemic, health systems are struggling to prioritize care for affected patients; however, physicians globally are also attempting to maintain care for other less-threatening medical conditions that may lead to permanent disabilities if untreated. Idiopathic intracranial hypertension (IIH) is a relatively common condition affecting young females that could lead to permanent blindness if not properly treated. In this article, we provide some insight and recommendations regarding the management of IIH during the pandemic.

METHODS

The diagnosis, follow-up, and treatment methods of IIH during the COVID-19 pandemic period are reviewed. COVID-19, as a mimic of IIH, is also discussed.

RESULTS

Diagnosis and follow-up of papilledema due to IIH during the COVID-19 pandemic can be facilitated by nonmydriatic fundus photography and optical coherence tomography. COVID-19 may mimic IIH by presenting as cerebral venous sinus thrombosis, papillophlebitis, or meningoencephalitis, so a high index of suspicion is required in these cases. When surgical treatment is indicated, optic nerve sheath fenestration may be the primary procedure of choice during the pandemic period.

CONCLUSION

IIH is a serious vision-threatening condition that could lead to permanent blindness and disability at a relatively young age if left untreated. It could be the first presentation of a COVID-19 infection. Certain precautions during the diagnosis and management of this condition could be taken that may allow appropriate care to be delivered to these patients while minimizing the risk of coronavirus infection.

Herpes Simplex Virus-2 Meningitis Masquerading as Pseudotumor Cerebri

We report a case of a 27-year-old obese female presenting with headache, blurry and double vision. She was found to have bilateral papilledema by an ophthalmologist and sent to the emergency department (ED). Cerebrospinal fluid (CSF) analysis showed elevated opening pressure and lymphocytic pleocytosis. Symptoms improved significantly after lumbar puncture (LP). Subsequently, polymerase chain reaction (PCR) for herpes simplex virus-2 (HSV-2) came back positive. This case represents an unusual presentation of HSV-2 meningitis, where the clinical picture was suggestive of pseudotumor cerebri or idiopathic intracranial hypertension (IIH), but CSF analysis revealed HSV-2. Papilledema and elevated intracranial pressure has not previously been described in association with HSV-2. Therefore, patients presenting with typical signs and meeting all diagnostic criteria for IIH in the presence of CSF pleocytosis may represent a distinct group of viral-induced intracranial hypertension. In these cases, an investigation of viral etiologies should be conducted.

Isolated intracranial hypertension associated with COVID-19

Background

Headache is a frequent complaint in COVID-19 patients. However, no detailed information on headache characteristics is provided in these reports. Our objective is to describe the characteristics of headache and the cerebrospinal fluid (CSF) profile in COVID-19 patients, highlighting the cases of isolated intracranial hypertension.

Methods

In this cross-sectional study, we selected COVID-19 patients who underwent lumbar puncture due to neurological complaints from April to May 2020. We reviewed clinical, imaging, and laboratory data of patients with refractory headache in the absence of other encephalitic or meningitic features. CSF opening pressures higher than 250 mmH₂O were considered elevated, and from 200 to 250 mmH₂O equivocal.

Results

Fifty-six COVID-19 patients underwent lumbar puncture for different neurological conditions. A new, persistent headache that prompted a CSF analysis was diagnosed in 13 (23.2%). The pain was throbbing, holocranial or bilateral in the majority of patients. All patients had normal CSF analysis and RT-qPCR for SARS-CoV-2 was negative in all samples. Opening pressure >200 mmH₂O was present in 11 patients and, in six of these, > 250 mmH₂O. 6/13 patients had complete improvement of the pain, five had partial improvement, and two were left with a daily persistent headache.

Conclusions

In a significant proportion of COVID-19 patients, headache was associated to intracranial hypertension in the absence of meningitic or encephalitic features. Coagulopathy associated with COVID-19 could be an explanation, but further studies including post-mortem analysis of areas of production and CSF absorption (choroid plexuses and arachnoid granulations) are necessary to clarify this issue.

Pseudotumor Cerebri Caused by SARS-CoV-2 Infection in a Boy

In this case report, we present the case of a 7-year-old male patient who started with diplopia and paralysis of the sixth unilateral cranial nerve after a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The cranial resonance was normal and the cerebrospinal pressure was 32 cm H2O detected by lumbar puncture. The treatment with corticosteroids and acetazolamide was effective. This is the first case of idiopathic intracranial hypertension associated to SARS-CoV-2 probably due to immune-mediated process.

Infectious and inflammatory disorders might increase the risk of developing idiopathic intracranial hypertension - a national case-control study

Objective

To investigate whether conditions causing inflammatory activation are associated with increased risk of idiopathic intracranial hypertension.

Methods

All newly diagnosed idiopathic intracranial hypertension patients (cases) in Sweden between 2000–2016 were identified using pre-determined algorithms (n = 902) and matched with five controls from the general population and five individuals with an obesity diagnosis (n = 4510) for age, sex, region, and vital status. National health registers provided information on infections, inflammatory disorders and dispensed medications. Conditional logistic regression was used to estimate odds ratios and 95% confidence intervals.

Results

Compared to general population controls, the cases had fourfold increased odds of having an infection (odds ratio = 4.3, 95% confidence interval 3.3–5.6), and threefold increased odds of an inflammatory disorder the year prior to idiopathic intracranial hypertension diagnosis (odds ratio = 3.2, 95% confidence interval 2.4–4.3). Organ specific analyses showed that odds were increased for the study diseases in the respiratory organ, kidney organ and gastrointestinal tract, but not for female genital infections. Similar results were found when comparing idiopathic intracranial hypertension with obese controls though the odds ratios were of lower magnitude. Sub-analyses on exposure to anti-infectious and anti-inflammatory drugs confirmed the increased odds ratios for idiopathic intracranial hypertension patients.

Conclusions

These findings suggest that major inflammatory activation may be a risk factor in idiopathic intracranial hypertension development.

Infantile Idiopathic Intracranial Hypertension: A Case Study and Review of the Literature

Idiopathic intracranial hypertension, or pseudotumor cerebri, is an increase in cerebrospinal fluid pressure of unknown etiology. It is mostly seen in adults, less frequently in adolescents, rarely in younger children. Only 5 infants meeting idiopathic intracranial hypertension criteria have been mentioned in the literature. We report a case of a previously healthy 9-month-old boy who presented with irritability, decreased appetite, and a bulging fontanelle. Computed tomography (CT) head imaging and cerebrospinal fluid studies revealed normal results. The patient's symptoms transiently resolved after the initial lumbar puncture, but 11 days later, his fontanelle bulged again. A second lumbar puncture revealed an elevated opening pressure of 35 cmH₂O and led to a diagnosis of idiopathic intracranial hypertension in accordance with the modified Dandy Criteria. Treatment with acetazolamide at a dose of 25 mg/kg/d was initiated and the patient remained symptom-free for 6 weeks, followed by another relapse. His acetazolamide dose was increased to 37 mg/kg/d, with no further relapses to date. A diagnosis of idiopathic intracranial hypertension is challenging in infants, because the patients cannot yet verbalize typical idiopathic intracranial hypertension-related symptoms such as positional headaches, diplopia, or pulsatile tinnitus. Furthermore, it is more difficult to assess papilledema in that age group. If undetected and untreated, idiopathic intracranial hypertension may result in permanent visual deficits. Little is known about idiopathic intracranial hypertension in infants, and age-specific treatment guidelines are lacking. We discuss this rare case of infantile idiopathic intracranial hypertension and provide a review of the literature, including an overview of disease characteristics and outcomes of idiopathic intracranial hypertension in this very young age group.

Population-based incidence and clinical characteristics of idiopathic intracranial hypertension

OBJECTIVE

To validate the diagnosis of idiopathic intracranial hypertension (IIH) from the Swedish National Patient Register (NPR) and investigate the incidence of IIH, as well as co-morbidities and medication use in a large Swedish population-based sample.

METHODS

We searched the NPR to find all patients ≥18 years old with the ICD-10 diagnosis code (G93.2) for IIH in Stockholm County from Jan 1, 2006, to Dec 31, 2013. All medical records were reviewed to validate the diagnosis and to collect additional information.

RESULTS

We included 207 patients with an IIH diagnosis, of which 135 (65%) were correctly diagnosed when validated by charts review. Eighty-three patients had disease onset during the study period. This gave a yearly incidence of 0.65/100 000. Female-to-male ratio was 6.1:1. Females, mean age 31.0 (CI 28.8-33.1), were younger at time of diagnosis compared to males, mean age 42.9 (CI 36.4-49.5), P<.001. The most common co-morbidities were obesity (92%), hormonal conditions (21%) and recent infections preceding the diagnosis (21%). Prior treatment with tetracycline derivatives were seen in 9%.

CONCLUSION

The incidence of IIH in Stockholm is in the lower range of previously reported rates, possibly due to a lower prevalence of obesity. A substantial proportion of patients (35%) did not fulfill diagnostic criteria. Disease onset occurs at younger age in females. Co-morbidities were mainly associated with diseases affecting hormonal balance or causing inflammatory activation. These findings raise new hypothetical theories regarding mechanisms involved in IIH pathogenesis.

Increased Intracranial Pressure in the Setting of Enterovirus and Other Viral Meningitides

Increased intracranial pressure due to viral meningitis has not been widely discussed in the literature, although associations with Varicella and rarely Enterovirus have been described. Patients with increased intracranial pressure and cerebrospinal fluid analysis suggestive of a viral process are sometimes classified as having atypical idiopathic intracranial hypertension (IIH). However, a diagnosis of IIH requires normal cerebrospinal fluid, and therefore in these cases an infection with secondary intracranial hypertension may be a more likely diagnosis. Here seven patients are presented with elevated intracranial pressure and cerebrospinal fluid suggestive of viral or aseptic meningitis. Of these, 1 had Enterovirus and the remainder were diagnosed with nonspecific viral meningitis. These data suggest that viral meningitis may be associated with elevated intracranial pressure more often than is commonly recognized. Enterovirus has previously been associated with increased intracranial pressure only in rare case reports.