Central Nervous System Tuberculosis

Intracranial tuberculomas: review of MRI findings and clinical features

AIM

To present a comprehensive analysis of the clinical features and magnetic resonance imaging (MRI) findings of intracranial tuberculomas in Indonesia.

MATERIALS AND METHODS

This was a retrospective analysis of brain MRI from 58 patients (29 women), mean age ± SD = 39 ± 2 years, diagnosed with intracranial tuberculomas. Clinical data, including symptoms, cerebrospinal fluid examination results, and MRI were also analysed. The diagnosis of intracranial tuberculoma was confirmed based on observed MRI changes following anti-tuberculosis therapy.

RESULTS

A total of 603 tuberculomas were fully detected via MRI in all patients. Among these lesions, 507 (84%) were located in the cerebrum, 61 (10%) in the cerebellum, 19 (3%) in the basal ganglia, 12 (2%) in the brain stem, and four (1%) in the thalamus. The MRI signals were classified into two groups: tuberculomas with caseating granulomas and tuberculomas with non-caseating granulomas. Among the patients, 29 had concomitant meningitis, seven had hydrocephalus, and four had cerebral infarction. Evidence of pulmonary tuberculosis was found in 16 patients, with one patient having coexisting thoracic vertebral tuberculosis.

CONCLUSION

The present study confirmed the significance of MRI as a valuable tool in the diagnosis of intracranial tuberculomas and the detection of associated abnormalities. The combination of MRI findings with clinical features can enhance the overall diagnostic accuracy for intracranial tuberculomas.

Bacterial, Viral, and Prion Infectious Diseases of the Brain

Diagnosis of brain infections is based on a combination of clinical features, laboratory markers, and imaging findings. Imaging characterizes the extent and severity of the disease, aids in guiding diagnostic and therapeutic procedures, monitors response to treatment, and demonstrates complications. This review highlights the characteristic imaging manifestations of bacterial and viral infections in the brain.

Magnetic resonance imaging findings in central nervous system tuberculosis: A pictorial review

Central nervous system (CNS) tuberculosis is a post-primary form of tuberculosis. It has high mortality and morbidity rates despite early diagnosis and treatment. CNS tuberculosis can manifest as subacute/chronic meningitis, parenchymal tuberculous lesions, and spinal tuberculosis. Hematogenous spread of tuberculous bacilli to the brain results in the development of so called "rich foci" on the pial surface, ependyma, and grey-white matter junction. Rupture of these "rich foci" into the subarachnoid space triggers an intense granulomatous inflammatory reaction. Tuberculous meningitis can manifest as leptomeningitis or pachymeningitis. Intracranial parenchymal tuberculous lesions may present as tuberculoma, tuberculous abscess, cerebritis, rhombencephalitis, and encephalopathy, with atypical presentations not uncommon. Complications of CNS tuberculosis encompass hydrocephalus, syrinx formation, vasculitis, infarcts, neuritis, and enduring neurological deficits. Post-contrast 3D fluid-attenuated inversion recovery (FLAIR) and post-contrast T1 spin-echo sequences excel in detecting tuberculous meningitis compared to other conventional magnetic resonance imaging (MRI) sequences. In proton magnetic resonance spectroscopy (PMRS), the presence of a lipid peak at 1.3 ppm is indicative of tuberculous lesions. Magnetization transfer (MT) imaging enhances the detection of tuberculous lesions, as the magnetization transfer ratio (MTR) of tuberculous pathologies, owing to their high lipid content, is lower than that in bacterial or fungal pathologies and higher than that in viral pathologies. This review article delves into the various typical and atypical imaging presentations of CNS tuberculosis in MRI, along with recent advances in imaging techniques.

Acute ischemic stroke in tuberculous meningitis

Background

The underlying mechanism for stroke in patients with tuberculous meningitis (TBM) remains unclear. This study aimed to investigate the predictors of acute ischemic stroke (AIS) in TBM and whether AIS mediates the relationship between inflammation markers and functional disability.

Methods

TBM patients admitted to five hospitals between January 2011 and December 2021 were consecutively observed. Generalized linear mixed model and subgroup analyses were performed to investigate predictors of AIS in patients with and without vascular risk factors (VAFs). Mediation analyses were performed to explore the potential causal chain in which AIS may mediate the relationship between neuroimaging markers of inflammation and 90-day functional outcomes.

Results

A total of 1,353 patients with TBM were included. The percentage rate of AIS within 30 days after admission was 20.4 (95% CI, 18.2-22.6). A multivariate analysis suggested that age ≥35 years (OR = 1.49; 95% CI, 1.06-2.09; P = 0.019), hypertension (OR = 3.56; 95% CI, 2.42-5.24; P < 0.001), diabetes (OR = 1.78; 95% CI, 1.11-2.86; P = 0.016), smoking (OR = 2.88; 95% CI, 1.68-4.95; P < 0.001), definite TBM (OR = 0.19; 95% CI, 0.06-0.42; P < 0.001), disease severity (OR = 2.11; 95% CI, 1.50-2.90; P = 0.056), meningeal enhancement (OR = 1.66; 95% CI, 1.19-2.31; P = 0.002), and hydrocephalus (OR = 2.98; 95% CI, 1.98-4.49; P < 0.001) were associated with AIS. Subgroup analyses indicated that disease severity (P for interaction = 0.003), tuberculoma (P for interaction = 0.008), and meningeal enhancement (P for interaction < 0.001) were significantly different in patients with and without VAFs. Mediation analyses revealed that the proportion of the association between neuroimaging markers of inflammation and functional disability mediated by AIS was 16.98% (95% CI, 7.82-35.12) for meningeal enhancement and 3.39% (95% CI, 1.22-6.91) for hydrocephalus.

Conclusion

Neuroimaging markers of inflammation were predictors of AIS in TBM patients. AIS mediates < 20% of the association between inflammation and the functional outcome at 90 days. More attention should be paid to clinical therapies targeting inflammation and hydrocephalus to directly improve functional outcomes.

Pediatric and adult meningeal, parenchymal, and spinal tuberculosis: A neuroimaging review

Neurotuberculosis is defined as a tuberculous infection of the meninges, brain parenchyma, vessels, cranial and spinal nerves, spinal cord, skull, and spine that can occur either in a localized or in a diffuse form. It is a heterogeneous disease characterized by many imaging appearances and it has been defined as "the great mimicker" due to similarities with many other conditions. The diagnosis of central nervous system (CNS) tuberculosis (TB) is based on clinical presentation, neuroimaging findings, laboratory and microbiological findings, and comprehensive evaluation of the response to anti-TB drug treatment. However, the absence of specific symptoms, the wide spectrum of neurological manifestations, the myriad of imaging findings, possible inconclusive laboratory results, and the paradoxical reaction to treatment make the diagnosis often challenging and difficult, potentially delaying adequate treatment with possible devastating short-term and long-term neurologic sequelae. Familiarity with the imaging characteristics helps in accurate diagnosis and may prevent or limit significantly morbidity and mortality. The goal of this review is to provide a comprehensive up-to-date overview of the conventional and advanced imaging features of CNS TB for radiologists, neuroradiologists, and pediatric radiologists. We discuss the most typical neurotuberculosis imaging findings and their differential diagnosis in children and adults with the goal to provide a global overview of this entity.

Imaging of Childhood Cerebral Vasculitis

Childhood cerebral vasculitis is a condition that affects the blood vessels in the brain of children and is rare but life-threatening. Imaging plays a crucial role in the diagnosis and monitoring of the disease. This article describes the classification, diagnostic algorithm, and various imaging modalities used in the evaluation of childhood cerebral vasculitis and the imaging findings associated with primary and secondary vasculitis. Understanding the imaging features of this condition can assist in early diagnosis, effective treatment, and improve outcomes.

Immune-Mediated Hypertrophic Pachymeningitis and its Mimickers: Magnetic Resonance Imaging Findings

Hypertrophic pachymeningitis (HP) is a rare and chronic inflammatory disorder presenting as localized or diffuse thickening of the dura mater. It can be idiopathic or an unusual manifestation of immune-mediated, infectious, and neoplastic conditions. Although some cases may remain asymptomatic, HP can lead to progressive headaches, cranial nerve palsies, hydrocephalus, and other neurological complications, which makes its recognition a fundamental step for prompt treatment. Regarding the diagnosis workup, enhanced MRI is the most useful imaging method to evaluate dural thickening. This article addresses the MR imaging patterns of immune-mediated HP, including immunoglobulin G4-related disease, neurosarcoidosis, granulomatosis with polyangiitis, rheumatoid pachymeningitis, and idiopathic HP. The main infectious and neoplastic mimicking entities are also discussed with reference to conventional and advanced MR sequences.

Localization of cerebral vasculopathy following bacterial meningitis: What can we learn about postinfective ischemic sequelae?

Cerebrovascular complications of bacterial meningitis account for a high incidence of mortality and postinfective neurologic sequelae. Cerebrovascular complications occurring during acute bacterial meningitis are evident from angiographic evidence demonstrating arterial occlusion and vessel wall narrowing, histopathological studies demonstrating vessel wall changes, and radiographic studies demonstrating the presence of brain infarcts. Cerebrovascular disease during bacterial meningitis has been demonstrated in of Haemophilus influenzae, Streptococcus pneumonia, Group B Streptococcus, and Mycobacterium tuberculosis models of meningitis. Despite models of bacterial meningitis showing variable patterns of cerebral vasculopathy as a contributor to different aspects of postinfectious neurological decline, very few studies describe the predominant localization of cerebral vasculopathy with different meningitis causing pathogens. Thus, this review attempts to analyze the different locations of cerebral vasculopathic changes occuring in response to different microbial pathogens and provide a pathophysiologic basis for such an observation.

Imaging recommendations and algorithms for pediatric tuberculosis: part 2-extrathoracic tuberculosis

Despite advances in diagnosis and treatment in recent years, tuberculosis (TB) remains a global health concern. Children are amongst the most vulnerable groups affected by this disease. Although TB primarily involves the lungs and mediastinal lymph nodes, it can affect virtually any organ system of the body. Along with clinical history combined with physical examination and laboratory tests, various medical imaging tools help establish the diagnosis. Medical imaging tests are also helpful for follow-up during therapy, to assess complications and exclude other underlying pathologies. This article aims to discuss the utility, strengths and limitations of medical imaging tools in the evaluation of suspected extrathoracic TB in the pediatric population. Imaging recommendations for the diagnosis will be presented along with practical and evidence-based imaging algorithms to serve as a guide for both radiologists and clinicians.

Intraspinal and Intracranial Neurotuberculosis, Clinical and Imaging Characteristics and Outcomes in Hospitalized Patients: A Cohort Study (2000-2022)

Neurotuberculosis (neuroTB) is a devastating disease, and is difficult to diagnose. The aim of this study was to analyze the clinical and imaging characteristics, and outcomes of a retrospective cohort (2000-2022) of hospitalized patients diagnosed with intraspinal and intracranial neuroTB. This work was designed through clinical, laboratory and imaging findings. Variables included: demographic data, history of tuberculosis, neurological complications, comorbidities and outcomes. Morbi-mortality risk factors were identified by univariate analysis. The cohort included: 103 patients with intraspinal and 82 with intracranial neuroTB. During the study period, in-hospital mortality of 3% for intraspinal and 29.6% for intracranial neuroTB was estimated. Motor deficit was found in all patients with intraspinal neuroTB. Risk factors for the unfavorable outcome of patients with intraspinal neuroTB were: age ≥ 40 years, diabetes mellitus (DM), diagnostic delay, kyphosis and spondylodiscitis ≥ 3 levels of involvement. Among the patients with intracranial neuroTB, 79/82 (96.3%) had meningitis and 22 patients had HIV infection (10 of them died). Risk factors for mortality from intracranial neuroTB were: HIV infection, hydrocephalus, stroke, lymphopenia and disseminated and gastrointestinal TB. Patients with intraspinal neuroTB had a significant number of destroyed vertebrae that determined their neurological deficit status. The mortality burden in intracranial neuroTB was conditioned by HIV infection and renal transplantation patients.

Clinicoepidemiological Profile and Prognostic Factors in Neurotuberculosis in Children

Purpose: This study aimed to determine the clinicoepidemiological profile and prognostic factors in children with neurotuberculosis.Methods: An observational study was conducted at a tertiary care hospital on 50 children diagnosed with neurotuberculosis. The demographic profile, clinical details, and all investigations were recorded on a predetermined form and datasheet for analysis, and disability severity was graded using the modified Rankin Scale.Results: Fifty patients were enrolled (male-to-female ratio, 1.08:1). Younger children (1 to 3 years) were more commonly affected. Most patients were malnourished, and only 58% had been immunized with the Bacillus Calmette-Guerin vaccine. Fever was the most common symptom (96%) followed by headache, altered consciousness, vomiting, seizures, and abnormal posture. On cerebrospinal fluid (CSF) analysis, 87% of patients showed pleocytosis with lymphocytic predominance. More than 80% of patients had CSF protein levels >100 mg/dL and CSF glucose levels <60 mg/dL. Common findings on neuroimaging were hydrocephalus (76%), basal meningeal enhancement (60%), basal exudates (52%), and parenchymal infarcts (32%). We noted a mortality rate of 40%, of whom 87.5% had modified British Medical Research Council (BMRC) stage 3 tubercular meningitis (TBM). All patients who survived stage 3 TBM had a severe disability, and over 50% of patients with stage 2 TBM had moderate to severe disabilities.Conclusion: Young age, lower socioeconomic status, BMRC stages 2 and 3, abnormal posture, hydrocephalus, and the presence of basal exudates were associated with poor outcomes. High suspicion is needed for early diagnosis and prevention of disability and mortality.

Magnetic Resonance Imaging Appearance of Giant Intracerebral Tuberculoma: A Retrospective Analysis

Background: Giant intracerebral tuberculomas are rare lesions but should be considered in the differential diagnosis of intracranial space-occupying lesion in an endemic region.Objective: The purpose of this study is to analyze the clinical data and magnetic resonance imaging (MRI) findings of giant intracerebral tuberculomas to improve the diagnostic precision.Material and Methods: The clinical and MRI findings of 22 patients of giant intracerebral tuberculoma were analyzed retrospectively. For the statistical analysis independent sample Student t-test was used.Results: For 22 patients included in this sample the giant intracerebral tuberculoma was of size more than 2.5cm. The majority of the giant tuberculomas (19 patients (86.4%))was located in the supratentorial area.T2-weighted hypointense core of giant tuberculoma was observed in 12 patients (54.5%) and T1 hyperintensities were observed in peripheral (wall) of the giant tuberculoma in 14 patients (63.6%). The mean ADC value of the peripheral (wall) of the giant tuberculoma was 1.034± 0.466[SD] x 10-3mm2/s and the core was 0.994± 0.455[SD] x 10-3mm2/s with a statistically significant difference (p-value <0.0005) in between. MR spectroscopy showed raised lipid peak at 0.9 to 1.33 ppm in 10 patients (45.5%),raised lipid-lactate peak in 12 patients (54.5%),raised Choline/Cr ratio more than 1.2 in 14 patients(63.6%) and Choline/Cr ratio less than 1.2 in 5 patients (22.7%). Associated involvement of lung was observed in the 6patients (27.3%), cervical lymph node in 1 patient (4.5%) and spine in 1patient (4.5%).Conclusions: MRI plays a vital role in distinguishing giant intracerebral tuberculomas from other intracranial space-occupying lesions, thereby allows the early institution of anti-tubercular treatment (ATT), decreased patient morbidity, mortality, and prevents unnecessary neurosurgical excision.

Global Frequency and Clinical Features of Stroke in Patients With Tuberculous Meningitis: A Systematic Review

IMPORTANCE

Stroke in tuberculous meningitis (TBM) is associated with significant morbidity and mortality.

OBJECTIVE

To determine the country-specific, regional, and overall prevalence of stroke among patients with TBM, including their clinical manifestations, stroke locations, and outcomes.

EVIDENCE REVIEW

This systematic review searched records in MEDLINE by PubMed, Scopus, and EMBASE until July 2020 for relevant articles on the occurrence and characteristics of stroke in TBM. Randomized clinical trials and cohort studies that included a population of patients with TBM were analyzed for clinical manifestations, type of stroke, area of stroke, vascular territory, and outcomes. Studies that did not report the occurrence of stroke, reported as abstract only with no full-texts available, and articles not in English were excluded. The country-specific, regional, and overall frequencies of stroke among patients with TBM were determined; secondary analysis enumerated the summary estimates of the clinical presentations, common locations of stroke, and outcomes. The Murad tool was used to assess methodological quality.

FINDINGS

From 852 articles identified, 71 studies involving 2194 patients with stroke in TBM were included. The sample size for each study ranged from 17 to 806 patients. The frequency of stroke in TBM showed an estimate of 0.30 (95% CI, 0.26-0.33). The most common clinical manifestations were fever and headache. The lateral striate, middle cerebral, and medial striate arteries were typically affected. The basal ganglia, cortex and lobar, and internal capsule were the frequently involved areas of the brain. The pooled proportions of mortality and poor outcomes were 0.22 (95% CI, 0.16-0.29) and 0.51 (95% CI, 0.37-0.66), respectively.

CONCLUSIONS AND RELEVANCE

The results of this systematic review suggest that stroke is considerably frequent among patients with TBM. The reported frequencies of stroke in TBM and its clinical features vary across the studies and populations.

Loss of Consciousness and Cardiac Arrest as an Atypical Presentation of Tubercular Meningitis: A Case Report

Tubercular meningitis is a devastating presentation of extra pulmonary tuberculosis, with fatality in each case without treatment. A 39 years male, a regular consumer of alcohol and a known case of major depressive disorder, presented with the alleged history of using an electric heater in a closed room, and presented to emergency with unconsciousness and cardiac arrest. As his neurological status didn't improve over 72 hrs, a magnetic resonance imaging brain was done which was non-conclusive. Electroencephalogram revealed diffuse right fronto-parietal seizure activity ceasing with midazolam injection, hence levetiracetam was started. Lumbar puncture revealed increased adenosine deaminase and nil white blood cells. Repeat lumbar puncture showed lymphocytic-predominant pleocytosis, elevated protein and low glucose. The patient was started on anti-tubercular therapy and an injection of dexamethasone was added. Repeat electroencephalogram didn't show any seizure-like activity. It is important to be aware of variety of presentations of tubercular meningitis. Delay in treatment leads to irreversible neurological damage and even death.

Keywords

cardiac arrest; case report; tubercular meningitis; unconsciousness.

Tuberculous meningitis in the elderly

OBJECTIVE

Although the elderly population remains at high risk for tuberculosis, studies addressing tuberculous meningitis (TBM) in this age group are scarce. The present study aimed to evaluate the spectrum and outcome of geriatric TBM and document differences between older and young patients.

METHODS

A prospective cohort study was conducted in the adult TBM patients admitted at PGIMER, Chandigarh (India). Consecutive older patients aged 60 years and above were enrolled from January 2019 to December 2020, and young adults aged 18-59 years were enrolled from July 2019 to December 2019.

RESULTS

Fifty-five older patients with a mean age of 66.6 years and 73 young patients with a mean age of 35.1 years were enrolled. At admission, older patients were more likely to have altered mental status (96.4% vs. 78.1%, P = 0.003) and advanced disease with British medical research council staging 2 or 3 (98.2% vs. 89.0%, P = 0.043); however, headache (38.2% vs. 67.1%, P = 0.001), vomiting (18.2% vs. 35.6%, P = 0.030) and fever (80.0% vs. 91.8%, P = 0.052) were less common. Cerebrospinal fluid (CSF) abnormalities were less marked in older patients, with a significant difference in median total cells (70 vs. 110/µl, P = 0.013). Hydrocephalous and infarct were common neuroimaging abnormalities in both groups; however, tuberculomas were significantly less in the elderly (15.1% vs. 35.2%, P = 0.012). Older patients had a significantly low survival rate (56.4% vs. 76.7%, P = 0.021).

CONCLUSION

Significant differences in clinical, CSF and radiological characteristics exist between elderly and young TBM patients, with survival remains dismal in the elderly.

Magnetic resonance imaging findings of intracranial tuberculoma patients in a tertiary hospital in Mogadishu, Somalia: A retrospective study

Introduction

Tuberculosis (TB) is a fatal disease caused by Mycobacterium tuberculosis (M.TB) with over eight million annual mortality reported worldwide attributed to the disease's direct or indirect effects. Among the most severe form of M. TB is an infection of the Central nervous system (CNS-TB). This infection is characterized by meningitis, tuberculoma, and tuberculous brain abscess. Tuberculomas are the most common variety of intracranial parenchymal tuberculosis. They occur because of conglomeration and conjugation of tubercular microgranulomas, which tend to occur at the grey-white matter junction due to the arrest of the hematogenous disseminating microbes caused by a decrease in the caliber of vessels in that region. Intracranial tuberculoma shows central hypointensity compared to grey matter, seeing this centrally on T2W images is helpful, as it is not seen in most other ring-enhancing lesions.

Objectives

The purpose of this study was to evaluate the findings of the magnetic resonance imaging (MRI) scan of patients with intracranial tuberculoma using retrospective hospital records.

Methodology

We conducted a retrospective data analysis of 73 patients with an age range of 3–70 years between 2018 and 2021 who were diagnosed with intracranial tuberculoma using MRI features at the Radiology Department, Somali-Turkey Recep Tayyip Erdogan Hospital. All the patients' MRI were evaluated, including conventional and contrast sequences and as well as MR diffusion.

Results

This study revealed that most tuberculoma patients were female with 43 (58.9%) and 30 (41.1%) male. According to age group, the majority of patients 30 (41.1%) were 18–30 years of age. Based on the distribution of the conglomerates’ tubercles, 39 (53.4%) were located in the supratentorial region, while 24 (32.9%) were found in both the supra-tentorial and infra-tentorial regions, with 10 (13.7%) residing in the infratentorial region. Interestingly, this study also discovered that the majority of the tuberculoma patients 43 (58.9%) had multifocal lesions, with 30 (41.1%) having single lesions. Also, associated abnormalities were detected in 28 (38.4%) of the patients with meningitis, while 7 (9.6%) had both hydrocephalus and meningitis, 2 (2.7%) had hydrocephalus, and one patient had cerebral infarction.

Conclusion

The outcome of this investigation shows MRI as a suitable diagnostic tool for the diagnosis of intracranial tuberculoma and associated abnormalities in geographic areas where tuberculosis is endemic.

•

Tuberculomas are the most common variety of intracranial parenchymal tuberculosis.

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MRI findings are suitable diagnostic tools for intracranial tuberculoma and associated abnormalities in patients having space-occupying lesions where tuberculosis is endemic.

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Early diagnosis and management will reduce the likelihood of irreversible neurological consequences and unnecessary biopsies for the patient.

Granulomatous Diseases of the Central Nervous System

PURPOSE OF REVIEW

To discuss the pathophysiology, key clinical features, necessary diagnostic evaluation, and current treatment regimens for granulomatous diseases of the central nervous system.

RECENT FINDINGS

The diagnosis and management of granulomatous disease of the central nervous system has been revolutionized by advances in diagnostic imaging. Nevertheless, tissue and/or cerebrospinal fluid (CSF) sampling remains necessary to establish the diagnosis in most cases. Establishing a specific diagnosis is critical because treatment selection needs to focus on the granulomatous process centering on either antibiotic or immunosuppressive agents. Particular for non-infectious granulomatous disease more aggressive immunotherapies may help in clinical outcome. There are multiple non-infectious and infectious etiologies for granulomatous disease of the central nervous system. Clinical manifestations result from local structural invasion of granulomas or granulomatous inflammation of the blood vessels and meninges. Rapid diagnosis and specific treatment is essential.

Case report: Depressive disorder with peripartum onset camouflages suspected intracranial tuberculoma

BACKGROUND

Co-occuring psychological symptoms and rare medical illnesses like intracranial tuberculoma add difficulties in diagnosing and treatment. The present report discussed a rare case of a young woman with tuberculoma and depressive disorder with peripartum onset.

CASE PRESENTATION

The patient was a 22-year-old woman. She underwent a cesarean section due to premature rupture of the membrane. She had developed behavioral changes for 3 months before admission and had been brought to general practitioner for several times during pregnancy. Her symptoms worsen after she underwent a cesarean section. She refused to answer doctor's and family's questions and she showed symptoms of depression. She was diagnosed with depressive disorder with peripartum onset and treated according to her diagnosis. However, she also experienced intermittent headaches which lead to suspicion that there was an organic cause for her complaints. Computed tomography (CT) was done and revealed suspected intracranial tuberculoma and meningitis. She died due to respiratory distress before she got adequate treatment for her illnesses.

CONCLUSION

The possibility of neurocognitive disorder due to infection such as intracranial tuberculoma should be considered as an additional diagnosis (co-occuring disease) or differential diagnosis in people who develop psychiatric symptoms, especially in areas with high tuberculosis incidence.

Relationship between magnetic resonance imaging findings and prognosis of intracranial tuberculosis

BACKGROUND

Intracranial tuberculosis (TB) is an intracranial infection caused by Mycobacterium tuberculosis. Magnetic resonance imaging (MRI), in particular enhanced MRI scan, has the ability to detect characteristic lesions of tuberculous meningitis or cerebral parenchymal TB.

PURPOSE

To analyze the relationship between MRI findings and prognosis of patients with intracranial TB.

MATERIAL AND METHODS

In this retrospective study, a total of 60 patients were confirmed with intracranial TB in the hospital from May 2019 to December 2020. All enrolled patients underwent TB-related laboratory examinations, cranial MRI, and contrast-enhanced MRI. Laboratory tests were analyzed and the relationship between clinical prognosis and cranial MRI features was evaluated.

RESULTS

Of the 60 patients, 28 (46.67%) had disseminated TB complications, 20 (36.67%) had secondary TB complications, and the remaining 10 (16.66%) had lymphatic TB or spinal TB complications. Of the patients, 25 had good short-term prognosis and 35 had poor short-term prognosis; 44 patients had good long-term prognosis and 16 had poor long-term prognosis. The incidence of cerebral parenchymal tuberculomas on enhanced MRI was significantly higher in the group with good prognosis compared to that in the group with poor prognosis (P < 0.05). Logistic analysis suggested that hydrocephalus (odds ratio [OR] = 0.057, 95% confidence interval [CI] = 0.003-0.444; P = 0.018) and cistern involvement (OR = 0.100, 95% CI = 0.011-0.581; P = 0.017) were independent risk factors for poor short-term prognosis.

CONCLUSION

MRI can display the pathological changes of intracranial TB in detail; hydrocephalus and cistern involvement were independent risk factors for poor short-term prognosis.

Neuromyelitis optica and concomitant pulmonary tuberculosis: a case report

Background

Concomitant diagnosis of neuromyelitis optica spectrum disease and pulmonary tuberculosis has rarely been reported.

Case report

We report a case involving a young Tunisian male patient who developed dry cough followed, 2 months later, by weakness in the lower limbs. The findings of central nervous system imaging and anti-aquaporin-4 antibody positivity were compatible with the diagnosis of neuromyelitis optica spectrum disease. Constellation of the clinical and the typical radiological pulmonary findings in our patient, coming from an endemic region, allowed the diagnosis of pulmonary tuberculosis, although sputum smear examination for acid-fast bacilli and cultures was negative. The patient received anti-tuberculous polytherapy associated with immunomodulation, consisting of methylprednisolone and intravenous immunoglobulins. Pulmonary infection symptoms initially improved but with no motor recovery. The patient suddenly died at home 4 months after the onset of the first symptoms. Current data regarding the clinical presentation of this underreported concomitant or associated condition, the possible pathophysiological mechanisms, and the therapeutic options were reviewed.

Conclusions

This case underscores the necessity to understand the exact mechanism of these coincident entities and to clarify the best immunomodulatory choice since immunosuppression targeting neuromyelitis optica spectrum disease can lead to dissemination of pulmonary tuberculosis.

Amide proton transfer imaging for differentiation of tuberculomas from high-grade gliomas: Preliminary experience

PURPOSE

Tuberculomas can occasionally masquerade as high-grade gliomas (HGG). Evidence from magnetisation transfer (MT) imaging suggests that there is lower protein content in the tuberculoma microenvironment. Building on the principles of chemical exchange saturation transfer and MT, amide proton transfer (APT) imaging generates tissue contrast as a function of the mobile amide protons in tissue's native peptides and intracellular proteins. This study aimed to further the understanding of tuberculomas using APT and to compare it with HGG.

METHOD

Twenty-two patients (n = 8 tuberculoma; n = 14 HGG) were included in the study. APT was a 3D turbo spin-echo Dixon sequence with inbuilt B₀ correction. A two-second, 2 μT saturation pulse alternating over transmit channels was applied at ±3.5 ppm around water resonance. The APT-weighted image (APTw) was computed as the MT ratio asymmetry (MTR_asym) at 3.5 ppm. Mean MTR_asym values in regions of interest (areas = 9 mm²; positioned in component with homogeneous enhancement/least apparent diffusion coefficient) were used for the analysis.

RESULTS

MTR_asym values of tuberculomas (n = 14; 8 cases) ranged from 1.34% to 3.11% (M = 2.32 ± 0.50). HGG (n = 17;14 cases) showed MTR_asym ranging from 2.40% to 5.70% (M = 4.32 ± 0.84). The inter-group difference in MTR_asym was statistically significant (p < 0.001). APTw images in tuberculomas were notable for high MTR_asym values in the perilesional oedematous-appearing parenchyma (compared to contralateral white matter; p < 0.001).

CONCLUSION

Tuberculomas demonstrate lower MTR_asym ratios compared to HGG, reflective of a relative paucity of mobile amide protons in the ambient microenvironment. Elevated MTR_asym values in perilesional parenchyma in tuberculomas are a unique observation that may be a clue to the inflammatory milieu.

MR vessel wall imaging in tubercular meningitis

PURPOSE

Tubercular meningitis (TBM) has the propensity to cause secondary vasculitis through various mechanisms leading to development of cerebrovascular complications. These vascular involvements can be detected by vessel wall imaging (VWI). In this study, we aimed to study detailed findings of vessel wall imaging in cases of tubercular meningitis.

METHODS

All consecutive patients of suspected tubercular meningitis in whom diagnosis of TBM could be made according to diagnostic criteria given by Ahuja et al. were included in the study. High-resolution MR VWI and time of flight (TOF) magnetic resonance angiography (MRA) were done along with routine MRI sequences. Arteries up to second-order branches were studied, and statistical analyses were done with respect to stage of tubercular meningitis, infarctions and TOF MRA findings.

RESULTS

Out of all 101 cases of TBM, infarctions were found in 49 cases (48.5%), and vessel wall enhancement was seen in 67 cases (66.3%). With increasing severity of disease, more severe vascular involvement was seen on VWI. There was significant association between enhancement of individual arteries and infarctions in their territories. VWI had better sensitivity than the MRA, while MRA had better specificity than VWI for detection of vascular complications.

CONCLUSION

Tubercular vasculitis can be detected by VWI in the form of nodular or smooth segmental enhancement of vessel wall with or without stenosis. Incorporation of VWI in routine MR imaging can play a greater role in early detection and management of cerebrovascular complications which can help to improve prognosis of the disease.

Microbiological Testing of Gastric Aspirate Improves the Diagnosis of Pulmonary Tuberculosis in Unconscious Adults with TB Meningitis

Conventional sputum collection for TB diagnosis is difficult in TB meningitis patients since most of them are admitted with decreased consciousness. It is assumed that unconscious patients swallow their sputum; therefore, gastric aspiration can replace sputum collection in unconscious patients. A prospective study was conducted to see whether examining gastric aspirate could increase the diagnosis certainty of pulmonary TB in such subjects. The inclusion criteria were age 18–60 years, decreased level of consciousness, and use of a nasogastric tube. Subjects who had taken antituberculosis drugs for more than 3 days were excluded. Gastric lavage was performed in the morning after an overnight fast. Specimens were examined for direct smear, culture, and rapid molecular testing. Demographic, clinical, chest X-ray, and laboratory data were also recorded. During the study period, 31 subjects were available. The positivity rates for microbiological tests were 19.3%, 41.9%, and 48.4% for smear, culture, and rapid molecular testing, respectively. All positive smears were confirmed by either culture or rapid molecular testing. Gastric lavage can be considered a tool for improving extraneural TB diagnosis in unconscious patients.

Central nervous system and spinal cord tuberculosis: Revisiting an important disease

Tuberculosis is a worldwide pandemic. Estimated that about 25% humans are colonized by Mycobacterium tuberculosis and about 1% are believed to develop the infection in the central nervous system (CNS-TB). Given the importance of this disease and its high levels of morbidity and mortality, it is imperative that every radiologist must be reminded of the most common findings of CNS-TB as there are several related differential diagnoses for this disease. The most common form CNS-TB is tuberculous meningitis (TBM), characterized mostly by basal meningitis, but infarction, hydrocephalus and tuberculomas could be present. Intracerebral tuberculosis is characterized by tuberculomas that can have different imaging features according to their stage. Vascular and spinal complications of tuberculosis are also reported. This review compiles the classic and unusual findings regarding CNS-TB together with new diagnostic scores in which neuroimaging have an important role.

Management of intracranial tuberculous mass lesions: how long should we treat for?

Tuberculous intracranial mass lesions are common in settings with high tuberculosis (TB) incidence and HIV prevalence. The diagnosis of such lesions, which include tuberculoma and tuberculous abscesses, is often presumptive and based on radiological features, supportive evidence of TB elsewhere and response to TB treatment. However, the treatment response is unpredictable, with lesions frequently enlarging paradoxically or persisting for many years despite appropriate TB treatment and corticosteroid therapy. Most international guidelines recommend a 9-12 month course of TB treatment for central nervous system TB when the infecting Mycobacterium tuberculosis ( M.tb) strain is sensitive to first-line drugs. However, there is variation in opinion and practice with respect to the duration of TB treatment in patients with tuberculomas or tuberculous abscesses. A major reason for this is the lack of prospective clinical trial evidence. Some experts suggest continuing treatment until radiological resolution of enhancing lesions has been achieved, but this may unnecessarily expose patients to prolonged periods of potentially toxic drugs. It is currently unknown whether persistent radiological enhancement of intracranial tuberculomas after 9-12 months of treatment represents active disease, inflammatory response in a sterilized lesion or merely revascularization. The consequences of stopping TB treatment prior to resolution of lesional enhancement have rarely been explored. These important issues were discussed at the 3 rd International Tuberculous Meningitis Consortium meeting. Most clinicians were of the opinion that continued enhancement does not necessarily represent treatment failure and that prolonged TB therapy was not warranted in patients presumably infected with M.tb strains susceptible to first-line drugs. In this manuscript we highlight current medical treatment practices, benefits and disadvantages of different TB treatment durations and the need for evidence-based guidelines regarding the treatment duration of patients with intracranial tuberculous mass lesions.

Management of intracranial tuberculous mass lesions: how long should we treat for?

Tuberculous intracranial mass lesions are common in settings with high tuberculosis (TB) incidence and HIV prevalence. The diagnosis of such lesions, which include tuberculoma and tuberculous abscesses, is often presumptive and based on radiological features, supportive evidence of TB elsewhere and response to TB treatment. However, the treatment response is unpredictable, with lesions frequently enlarging paradoxically or persisting for many years despite appropriate TB treatment and corticosteroid therapy. Most international guidelines recommend a 9-12 month course of TB treatment for central nervous system TB when the infecting Mycobacterium tuberculosis ( M.tb) strain is sensitive to first-line drugs. However, there is variation in opinion and practice with respect to the duration of TB treatment in patients with tuberculomas or tuberculous abscesses. A major reason for this is the lack of prospective clinical trial evidence. Some experts suggest continuing treatment until radiological resolution of enhancing lesions has been achieved, but this may unnecessarily expose patients to prolonged periods of potentially toxic drugs. It is currently unknown whether persistent radiological enhancement of intracranial tuberculomas after 9-12 months of treatment represents active disease, inflammatory response in a sterilized lesion or merely revascularization. The consequences of stopping TB treatment prior to resolution of lesional enhancement have rarely been explored. These important issues were discussed at the 3 rd International Tuberculous Meningitis Consortium meeting. Most clinicians were of the opinion that continued enhancement does not necessarily represent treatment failure and that prolonged TB therapy was not warranted in patients presumably infected with M.tb strains susceptible to first-line drugs. In this manuscript we highlight current medical treatment practices, benefits and disadvantages of different TB treatment durations and the need for evidence-based guidelines regarding the treatment duration of patients with intracranial tuberculous mass lesions.

Spinal Tuberculosis: Clinicoradiological Findings in 274 Patients

Background

Mycobacterium tuberculosis is a major cause of myelopathy and radiculopathy in settings with a high prevalence of tuberculosis/human immunodeficiency virus (HIV) coinfection. However, a paucity of publications exists on the spectrum of neurological and magnetic resonance (MR) imaging findings of spinal tuberculosis in these populations.

Methods

We conducted a retrospective study of adults with spinal tuberculosis at a referral center in South Africa for patients with spinal disease without bony involvement seen at plain film radiography. We report the clinical, laboratory and spinal MR imaging findings, compare HIV-infected and HIV-uninfected patients, and correlate clinical and cerebrospinal fluid findings with those of MR imaging.

Results

Of 274 patients, 209 (76%) were HIV infected and 49 (18%) were HIV uninfected. Radiculomyelitis occurred in 77% (n = 210), and spondylitis in 39% (n = 106). Subdural abscess (n = 42) and intramedullary tuberculoma (n = 33) were common. In 24% of HIV-infected and 14% of HIV-uninfected patients, spinal disease manifested as a paradoxical tuberculosis reaction, frequently following tuberculous meningitis. The triad of neurological deficit, fever, and back pain was similar in patients with spondylitis (24%), epi/subdural abscess without bony disease (14%), meningoradiculitis (17%), and isolated myelitis (17%) .

Conclusions

Radiculomyelitis is a common manifestation of spinal tuberculosis in settings with high tuberculosis/HIV prevalence, often presenting as a paradoxical reaction. We describe a high frequency of rarely reported spinal tuberculosis manifestations, suggesting that these are more common than implied by the literature.

Management of intracranial tuberculous mass lesions: how long should we treat for?

Tuberculous intracranial mass lesions are common in settings with high tuberculosis (TB) incidence and HIV prevalence. The diagnosis of such lesions, which include tuberculoma and tuberculous abscesses, is often presumptive and based on radiological features, supportive evidence of TB elsewhere and response to TB treatment. However, the treatment response is unpredictable, with lesions frequently enlarging paradoxically or persisting for many years despite appropriate TB treatment and corticosteroid therapy. Most international guidelines recommend a 9-12 month course of TB treatment for central nervous system TB when the infecting Mycobacterium tuberculosis (M.tb) strain is sensitive to first-line drugs. However, there is variation in opinion and practice with respect to the duration of TB treatment in patients with tuberculomas or tuberculous abscesses. A major reason for this is the lack of prospective clinical trial evidence. Some experts suggest continuing treatment until radiological resolution of enhancing lesions has been achieved, but this may unnecessarily expose patients to prolonged periods of potentially toxic drugs. It is currently unknown whether persistent radiological enhancement of intracranial tuberculomas after 9-12 months of treatment represents active disease, inflammatory response in a sterilized lesion or merely revascularization. The consequences of stopping TB treatment prior to resolution of lesional enhancement have rarely been explored. These important issues were discussed at the 3rd International Tuberculous Meningitis Consortium meeting. Most clinicians were of the opinion that continued enhancement does not necessarily represent treatment failure and that prolonged TB therapy was not warranted in patients presumably infected with M.tb strains susceptible to first-line drugs. In this manuscript we highlight current medical treatment practices, benefits and disadvantages of different TB treatment durations and the need for evidence-based guidelines regarding the treatment duration of patients with intracranial tuberculous mass lesions.

Evaluation of cases of pediatric extrapulmonary tuberculosis: a single center experience

Aim:

Extrapulmonary tuberculosis is observed more frequently and leads to complications with a higher rate in children compared with adults because the risk of lymphohematogen spread is higher. In this study, the clinical, laboratory, and radiologic findings and treatment outcomes were evaluated in pediatric patients who were followed up in our clinic with a diagnosis of extrapulmonary tuberculosis.

Material and Methods:

Seventy patients aged 0–18 years who were followed up with a diagnosis of extrapulmonary tuberculosis between 2008 and 2017 in the Division of Pediatric Infectious Diseases in our hospital were examined retrospectively.

Results:

The median age of the patients was 8,8 (range, 0,4–17) years and 47.1% were female (n=33). Twenty-seven patients (38.6%) were aged 0–4 years, 15 (21.4%) were aged 5–9 years, and 28 patients (40%) were aged 10–18 years. Forty-four patients (62.9%) were diagnosed as having extrapulmonary tuberculosis and 26 (37.1%) had pulmonary + extrapulmonary tuberculosis. The most common form of extrapulmonary tuberculosis was extrathoracic lymphadenopathy, which was found in 22 patients (31.4%). The other patients were diagnosed as having musculoskeletal system tuberculosis (n=10, 14.3%), gastrointestinal system tuberculosis (n=9, 12.9%), miliary tuberculosis (n=8, 11.4%), intrathoracic lymphadenopathy (n=7, 10%), renal tuberculosis (n=6, 8.6%), central nervous system tuberculosis (n=5, 7.1%), and pleural tuberculosis (n=3, 4.3%). Among a total of 58 patients in whom tuberculin skin test and interferon gamma release tests were studied together, tuberculin skin test positivity (n=37, 63.8%) was found with a higher rate compared with interferon gamma release test positivity (n=32, 55.2%), but the difference was not statistically significant (p=0.35). The median treatment period was 12 (range, 6–24) months. Among the patients whose treatments were terminated, improvement was observed in 52 patients (74.2%) and the development of sequela was observed in six patients (8.5%). Two patients who were diagnosed as having central nervous system tuberculosis (2.8%) died.

Conclusion:

Clinical, laboratory, and radiologic data should be evaluated together when making a diagnosis of extrapulmonary tuberculosis in children. Interferon gamma release tests alone are not superior to tuberculin skin test, but should be considered to be used in combination in the diagnosis.

Neuroimaging Findings in Tuberculosis: A Single-Center Experience in 559 Cases

BACKGROUND AND PURPOSE

There is a paucity of literature related to the neuroimaging of CNS tuberculosis (TB) and largely covers pediatric CNS TB. The objective of this study was to determine the frequency of different forms of CNS TB and its associated complications and to study longitudinal disease course using computed tomography (CT) and MRI.

METHODS

Retrospective chart and imaging review of patients diagnosed with CNS TB in a tertiary care hospital in Pakistan over a 10-year period. A total of 452 initial brain MRI and 209 CT scans were reviewed by an expert radiologist specialized in neuroimaging. This was followed by review of 53 MRI/52 CT and 7 MRI/14 CT first and second follow-up scans, respectively.

RESULTS

Note that 559 patients, 296 males and 263 females were included in the study. On the initial CT scans, tuberculomas were found in 25 (12%), infarction in 54 (25%), basal meningeal enhancement in 29 (14%), and hydrocephalus in 84 (40%). On initial MRI, tuberculomas were found in 182 (40%), infarction in 120 (27%), basal meningeal enhancement in 184 (41%), and hydrocephalus in 116 (26%). On review of follow-up CT scans, 13 (25%) showed new or worsening hydrocephalus, 8 (15%) showed new infarcts, 1 exhibited new tuberculoma, and 5 showed worsening cerebral edema. On review of follow-up MRI scans, new or worsening hydrocephalus was seen in 3 (6%), new infarcts in 3 (6%), new tuberculoma in 10 (19%), worsening cerebral edema in 7 (13%), and TB myelitis in 4 (8%) patients.

CONCLUSIONS

Tuberculoma, hydrocephalus, and cerebral infarcts are the most prominent findings in CNS tuberculosis. Our study showed development of new lesions on subsequent neuroimaging suggesting a dynamic and progressive nature of the disease process in some individuals.

Metastatic Malignant Lymphoma Mimicking Cerebral Toxoplasmosis with the "Target Sign"

We herein report the case of a 60-year-old man with a "target sign" in the left frontal lobe on magnetic resonance imaging (MRI), which is thought to be a specific sign of cerebral toxoplasmosis. ¹⁸F-fluorodeoxyglucose-positron emission tomography showed no increased uptake, and ²⁰¹Tl-single photon emission computed tomography showed the focal uptake in the left frontal lesion. On a brain biopsy, the patient was given a definitive diagnosis of brain metastasis from diffuse large B-cell lymphoma, and cerebral toxoplasmosis was excluded. In the present case, multilayer intensities on MRI may reflect the fast-growing nature of this tumor.

Dural masses: meningiomas and their mimics

Meningiomas are the most common dural tumour. They are regularly being seen as an incidental finding on brain imaging and treated conservatively. However, there are many other dural masses which mimic their appearances, including primary neoplastic processes, metastases, granulomatous diseases and infection. While some of these are rare, others such as metastases and tuberculosis arise relatively frequently in practice. Although not pathognomonic, key features which increase the probability of a lesion being a meningioma include intralesional calcifications, skull hyperostosis, local dural enhancement and increased perfusion. It is important to have an awareness of these entities as well as their main imaging findings, as they have a wide range of prognoses and differing management strategies. This review outlines several of the most important mimics along with their imaging findings on both standard and advanced techniques with key features which may be used to help differentiate them from meningiomas.

Magnetic resonance imaging spectrum of intracranial tubercular lesions: one disease, many faces

Tuberculosis is a devastating disease and has shown resurgence in recent years with the advent of acquired immunodeficiency syndrome. Central nervous system involvement is the most devastating form of the disease, comprising 10% of all tuberculosis cases. The causative organism, Mycobacterium tuberculosis, incites a granulomatous inflammatory response in the brain, the effects of which can be appreciated on magnetic resonance imaging (MRI), which can thus be used for diagnosis of the same. Neurotuberculosis can present in various patterns, which can be identified on MRI. The meningeal forms include leptomeningitis and pachymeningitis. Parenchymal forms of neurotuberculosis include tuberculoma in its various stages, tubercular cerebritis and abscess, tubercular rhombencephalitis, and tubercular encephalopathy. Each pattern has characteristic MRI appearances and differential diagnoses on imaging. Complications of neurotuberculosis, usually of tubercular meningitis, include hydrocephalus, vasculitis, and infarcts as well as cranial nerve palsies. Various MRI sequences besides the conventional ones can provide additional insight into the disease, help in quantifying the disease load, and help in differentiation of neurotuberculosis from conditions with similar imaging appearances and presentations. These can enable accurate and timely diagnosis by the radiologist and early institution of treatment in order to reduce the likelihood of permanent neurological sequelae.

Progress on Diagnosis of Tuberculous Meningitis

Central nervous system (CNS) disease caused by Mycobacterium tuberculosis (MTB) is highly devastating. Tuberculous meningitis (TBM) is the most common form of CNS tuberculosis (TB). Rapid, sensitive, and affordable diagnostic tests are not available. Ziehl-Neelsen (ZN) stain has a very low sensitivity in cases of TBM, the sensitivity rates is of about 10-20%.The detection rate can be improved by taking large volume CSF samples (>6 ml) and prolonged slide examination (30 min). Culture of MTB from the CSF is slow and insufficiently sensitive. The sensitivity is different, which varies from 36% to 81.8%. The microscopic observation drug susceptibility (MODS) assay was recommended by the World Health Organization in 2011. The sensitivity is 65%, which is more sensitive and faster than CSF smear. Commercial PCR assays were found to be insensitive at detecting MTB in CSF samples. Many research provided the value of ADA on the TBM diagnosis. Interferon-gamma release assays (IGRAs) are not recommended for diagnosis of active TB disease. Imaging is essential in diagnosis and showing complications of CNS TB. Thwaites criteria and the Lancet consensus scoring system (LCSS) were developed to improve the diagnosis of TBM. Clinicians will continue to make judgment based on clinical examination, inflammatory CSF examinations, imaging studies, and scoring systems.

Neuroimaging in Central Nervous System Infections

Radiologic imaging is often employed to supplement clinical evaluation in cases of suspected central nervous system (CNS) infection. While computed tomography (CT) is superior for evaluating osseous integrity, demineralization, and erosive changes and may be more readily available at many institutions, magnetic resonance imaging (MRI) has significantly greater sensitivity for evaluating the cerebral parenchyma, cord, and marrow for early changes that have not yet reached the threshold for CT detection. For these reasons, MRI is generally superior to CT for characterizing bacterial, viral, fungal, and parasitic infections of the CNS. The typical imaging features of common and uncommon CNS infectious processes are reviewed.

Atypical Cerebral Manifestations of Disseminated Mycobacterium tuberculosis

Background

We investigated the patterns of cerebral manifestations in patients with underlying pulmonary or extrapulmonary tuberculosis or disseminated tuberculosis.

Materials and methods

From January 2010 to September 2016, brain magnetic resonance imaging (MRI) scans were obtained to evaluate cerebral manifestations in patients with underlying pulmonary or extrapulmonary tuberculosis. We also included patients with drug-resistant tuberculosis or disseminated tuberculosis. MRI findings of tuberculous meningitis and tuberculoma were classified as typical; other MRI findings were classified as atypical. Demographic data, risk factors, and drug regimens were collected and analyzed.

Results

Twenty-two patients were diagnosed with cerebral tuberculosis. Cerebral tuberculosis was due to hematogenous spread from pulmonary tuberculosis (10 patients), spinal tuberculosis (8 patients), disseminated tuberculosis (3 patients), and unknown causes (1 patient). There were six patients with typical MRI findings (three patients with typical meningitis involving the basal cistern and supratentorium, one patient with tuberculomas, and two patients with both) and seven patients with atypical MRI findings [five patients with evidence of early meningitis, such as high signal intensity on fluid-attenuated inversion recovery (FLAIR) along the cerebellar folia, and two patients with only hydrocephalus].

Conclusion

Besides the typical sites of meningeal involvement, overlooked findings such as FLAIR abnormalities along the cerebellar folia or hydrocephalus should be checked for early detection of cerebral tuberculosis and initiation of the appropriate treatment against disseminated tuberculosis.

Extrapulmonary involvement in pediatric tuberculosis

Tuberculosis in childhood is clinically challenging, but it is a preventable and treatable disease. Risk factors depend on age and immunity status. The most common form of pediatric tuberculosis is pulmonary disease, which comprises more than half of the cases. Other forms make up the extrapulmonary tuberculosis that involves infection of the lymph nodes, central nervous system, gastrointestinal system, hepatobiliary tree, and renal and musculoskeletal systems. Knowledge of the imaging characteristics of pediatric tuberculosis provides clues to diagnosis. This article aims to review the imaging characteristics of common sites for extrapulmonary tuberculous involvement in children.

MR imaging of adult acute infectious encephalitis

BACKGROUND

Imaging is a key tool for the diagnosis of acute encephalitis. Brain CT scan must be urgently performed to rule out a brain lesion with mass effect that would contraindicate lumbar puncture. Brain MRI is less accessible than CT scan, but can provide crucial information with patients presenting with acute encephalitis.

METHOD

We performed a literature review on PubMed on April 1, 2015 with the search terms "MRI" and "encephalitis".

RESULTS

We first described the various brain MRI abnormalities associated with each pathogen of acute encephalitis (HSV, VZV, other viral agents targeting immunocompromised patients or travelers; tuberculosis, listeriosis, other less frequent bacterial agents). Then, we identified specific patterns of brain MRI abnomalies that may suggest a particular pathogen. Limbic encephalitis is highly suggestive of HSV; it also occurs less frequently in encephalitis due to HHV6, syphillis, Whipple's disease and HIV primary infection. Rhombencephalitis is suggestive of tuberculosis and listeriosis. Acute ischemic lesions can occur in patients presenting with severe bacterial encephalitis, tuberculosis, VZV encephalitis, syphilis, and fungal infections.

CONCLUSION

Brain MRI plays a crucial role in the diagnosis of acute encephalitis. It detects brain signal changes that reinforce the clinical suspicion of encephalitis, especially when the causative agent is not identified by lumbar puncture; it can suggest a particular pathogen based on the pattern of brain abnormalities and it rules out important differential diagnosis (vascular, tumoral or inflammatory causes).

Magnetic resonance imaging characteristics and treatment aspects of ventricular tuberculosis in adult patients

BACKGROUND

Ventricular involvement in neurotuberculosis is rare. The literature regarding the characteristics of magnetic resonance imaging (MRI) in ventricular tuberculosis is very limited.

PURPOSE

To describe MRI characteristics of ventricular tuberculosis and discuss the medical treatment along with the clinical outcome.

MATERIAL AND METHODS

Ten patients (6 men, 4 women; average age, 39 years) were diagnosed with ventricular tuberculosis during a period of 3 years. Four patients had the history of pulmonary/pleural tuberculosis. The clinical and MRI features of these patients were reviewed retrospectively.

RESULTS

On a brain MRI, three patients showed ependymitis associated with contrast enhancement of the ependymal lining of the ventricular walls. One patient had choroid plexitis associated with prominent swollen and marked enhancement of the choroid plexus. One patient had intraventricular tuberculoma associated with an intraventricular nodule. Two patients had both ependymitis and choroid plexitis. Three patients had both intraventricular tuberculoma and choroid plexitis. Four patients had hydrocephalus. All patients underwent intrathecal injection of isoniazid and dexamethasone combined with multidrug anti-tuberculosis treatment. All patients had a good clinical recovery, except for one who developed hemi-paralysis due to cerebral infarction. On the repeated MRI of eight patients after therapy, all lesions disappeared or decreased in size, apart from in one patient who showed ventricular separation.

CONCLUSION

MRI characteristics of ventricular tuberculosis included ependymal enhancement, swelling, and enhancement of the choroid plexus and intraventricular tuberculomas. Intrathecal injection of isoniazid and dexamethasone along with multidrug chemotherapy showed good efficacy in ventricular tuberculosis.

Imaging in extrapulmonary tuberculosis

Tuberculosis (TB) remains a major global public health problem, with 1.5 million deaths annually worldwide. One in five cases of TB present as extrapulmonary TB (EPTB), posing major diagnostic and management challenges. Mycobacterium tuberculosis adapts to a quiescent physiological state and is notable for its complex interaction with the host, producing poorly understood disease states ranging from latent infection to active clinical disease. New tools in the diagnostic armamentarium are urgently required for the rapid diagnosis of TB and monitoring of TB treatments, and to gain new insights into pathogenesis. The typical and atypical imaging features of EPTB are reviewed herein, and the roles of several imaging modalities for the diagnosis and management of EPTB are discussed.

Cerebral hemorrhage due to tuberculosis meningitis: a rare case report and literature review

Tuberculosis (TB) is a common disease to threaten human health. TB of the central nervous system (CNS) is rare but the most serious type of systemic TB because of its high mortality rate, serious neurological complications and sequelae. In this case report, we describe a woman who presented with walking instability, intracerebral hemorrhage and leptomeningeal enhancement due to tuberculosis meningitis. The patient had no significant medical history and the initial clinical symptoms were walking instability. On analysis, the cerebrospinal fluid was colorless and transparent, the pressure was more than 400 mm H₂O, there was lymphocytic pleocytosis, increased protein, and decreased glucose levels present. No tuberculosis or other bacteria were detected. The patient's brain computed tomography image showed intra-cerebral hemorrhage (ICH) and contrast magnetic resonance imaging showed ICH in the right frontal lob, and leptomeningeal enhancement. CNS TB is rare but has a high mortality rate. As this disease has no unique characteristics at first presentation such as epidemiology and obvious clinical manifestation, a diagnosis of CNS TB remains difficult.