Mild Encephalitis/Encephalopathy with a Reversible Lesion in The Splenium

Zerrin Yıldırım1,2, Sibel Mumcu Timer3, Didem Çelik4

  • 1İstanbul University, Aziz Sancar Institute of Experimental Medicine, Department of Neuroscience, İstanbul, Turkey.

Noro Psikiyatri Arsivi
|March 13, 2023
PubMed

Insights

Mild encephalitis/encephalopathy with a reversible lesion in the splenium (MERS) is a brain condition with mild symptoms and reversible splenium lesions. This report details four MERS cases, including one linked to COVID-19.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Radiology

Background:

  • Mild encephalitis/encephalopathy with a reversible lesion in the splenium (MERS) is a clinico-radiological syndrome.
  • It presents with mild central nervous system symptoms and reversible splenium lesions.
  • MERS is often associated with viral and bacterial infections, including COVID-19.

Observation:

  • This paper reports four cases of MERS.
  • The patients presented with diverse underlying conditions.
  • These included mumps infection, aseptic meningitis, Marchiafava-Bignami disease, and atypical pneumonia due to COVID-19.

Findings:

  • The study highlights the varied etiology of MERS.
  • It underscores the association between MERS and different infectious agents.
  • One case demonstrates a link between MERS and Coronavirus disease 2019 (COVID-19).

Implications:

  • Understanding the diverse causes of MERS is crucial for accurate diagnosis.
  • Recognizing MERS in the context of infections like COVID-19 is important for patient management.
  • Further research into the pathogenesis of MERS may reveal new therapeutic targets.

Related Concept Videos

Arboviral Encephalitis01:25

Arboviral Encephalitis

Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
Encephalitis l: Introduction01:19

Encephalitis l: Introduction

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...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Brain Abscess l: Introduction01:26

Brain Abscess l: Introduction

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 infections,...
Cerebral Edema ll: Pathophysiology01:22

Cerebral Edema ll: Pathophysiology

Vasogenic edema is a major form of cerebral edema characterized by abnormal accumulation of fluid in the brain’s extracellular space due to disruption of the blood–brain barrier (BBB). The BBB is a specialized structure composed of endothelial cells connected by tight junctions, supported by astrocytic endfeet and a basement membrane. Under normal conditions, it tightly regulates the movement of ions, proteins, and solutes between the bloodstream and brain parenchyma. When this barrier loses...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...