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Bacterial Meningitis I: Introduction01:22

Bacterial Meningitis I: Introduction

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Bacterial meningitis is a severe, life-threatening inflammation of the meninges, particularly the pia mater and arachnoid mater, affecting the subarachnoid space, ventricles, and cerebrospinal fluid (CSF). If untreated, it can lead to significant neurological complications or death.Causative AgentsCommon pathogens vary with age and immune status. In adults, major organisms include Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae. Streptococcus agalactiae (group B...
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Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
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Viral Meningitis01:18

Viral Meningitis

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Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...
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A brain abscess is a focal, intracerebral infection characterized by a localized collection of pus within the brain parenchyma, resulting from microbial invasion and the body’s inflammatory response. It progresses through stages: early and late cerebritis, followed by early and late capsule formation, reflecting tissue destruction, immune response, and eventual encapsulation.Etiology and PathogenesisCausative organisms vary with source and host factors, often involving polymicrobial...
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Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...
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Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased...
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Listeria monocytogenes Infection of the Brain
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Klebsiella meningitis. A case report.

N Medhi1, P Goswami, P Sarma

  • 1Radiology Department, Primus, Guwahati; Assam; India - drnirodmedhi@yahoo.co.in.

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Klebsiella pneumoniae meningitis, a severe CNS infection, often presents with seizures and increased intracranial pressure. Early MRI diagnosis and treatment are crucial for reducing mortality and complications like subdural hygroma.

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Area of Science:

  • Neurology
  • Infectious Diseases
  • Radiology

Background:

  • Acute bacterial meningitis is a critical central nervous system (CNS) infection, predominantly affecting infants and children.
  • Gram-negative bacterial meningitis, particularly from Klebsiella pneumoniae, is rare but associated with severe outcomes and high fatality rates.
  • Common presentations include fever, uncontrolled seizures, and signs of increased intracranial pressure (ICP).

Purpose of the Study:

  • To report a case of acute bacterial meningitis caused by Klebsiella pneumoniae.
  • To highlight the diagnostic utility of Magnetic Resonance (MR) imaging in identifying complications.
  • To emphasize the importance of early diagnosis and treatment in managing this severe infection.

Main Methods:

  • Case report detailing a patient with Klebsiella pneumoniae meningitis.
  • Utilized Magnetic Resonance (MR) imaging for comprehensive evaluation of CNS complications.
  • Reviewed clinical presentation, diagnostic findings, and treatment course.

Main Results:

  • The patient presented with symptoms indicative of severe CNS infection, including seizures and raised ICP.
  • MR imaging revealed significant complications: sinus thrombosis, venous infarcts, and subdural hygroma.
  • Klebsiella pneumoniae was identified as the causative agent.

Conclusions:

  • Klebsiella pneumoniae meningitis, though uncommon, poses a significant threat with potentially devastating complications.
  • Early diagnosis via advanced imaging like MRI is essential for identifying complications such as sinus thrombosis and subdural hygroma.
  • Prompt therapeutic intervention is critical to mitigate mortality and morbidity associated with this severe infection.