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Related Concept Videos

Cranial and Spinal Meninges01:19

Cranial and Spinal Meninges

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The cranial and spinal meninges are complex protective structures surrounding the central nervous system (CNS), consisting of the brain and spinal cord. These meninges consist of the dura mater, the arachnoid mater, and the pia mater. They protect the CNS, provide structural support, and aid in circulating cerebrospinal fluid (CSF).
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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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Cerebrospinal Fluid01:21

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Cerebrospinal fluid (CSF) is a colorless liquid that flows around the brain and the spinal cord, playing a vital role in the protection, support, and overall function of the central nervous system (CNS). CSF production, circulation, and absorption are tightly regulated processes essential for the brain and spinal cord to function properly.
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There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen.
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The human body's intricate network of arteries ensures that every organ system receives the necessary oxygen and nutrients for optimal function. The arterial network in the head and neck region is particularly complex, providing vital blood flow to the brain, eyes, and other critical structures. Prominent arteries in this region include the internal carotid arteries and the vertebral arteries.
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Related Experiment Video

Updated: Jul 2, 2025

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
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FLAIR hyperintensity in the subarachnoid space: Main differentials.

J Miranda Bautista1, I Garrido Morro1, P Fernández García1

  • 1Servicio de Radiodiagnóstico, HGU Gregorio Marañón, Madrid, Spain.

Radiologia
|February 16, 2024
PubMed
Summary
This summary is machine-generated.

Fluid-attenuated inversion recovery (FLAIR) MRI sequences can show hyperintensity in the arachnoid space. This finding may indicate disease or be caused by artifacts, potentially leading to diagnostic errors.

Keywords:
Cerebrospinal fluidEspacio subaracnoideoFLAIR sequenceHiperintensidadHyperintensityLíquido cefalorraquídeoMagnetic resonance imagingResonancia magnéticaSecuencia FLAIRSubarachnoid space

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Area of Science:

  • Neuroimaging
  • Radiology
  • Medical Diagnostics

Background:

  • Fluid-attenuated inversion recovery (FLAIR) is a crucial brain MRI sequence.
  • FLAIR suppresses cerebrospinal fluid signal, aiding subarachnoid space disease detection.
  • Hyperintensity in the arachnoid space on FLAIR can be pathological or artifactual.

Purpose of the Study:

  • To differentiate between pathological and artifactual causes of arachnoid space hyperintensity on FLAIR MRI.
  • To highlight the potential for diagnostic errors due to non-pathological FLAIR findings.
  • To provide a comprehensive overview of conditions causing FLAIR hyperintensity.

Main Methods:

  • Review of existing literature on FLAIR MRI findings.
  • Analysis of cases presenting with arachnoid space hyperintensity.
  • Categorization of hyperintensity causes into disease-related and artifact-related.

Main Results:

  • Known causes of hyperintensity include tumors, inflammation, vascular disease, and CSF cellularity.
  • Numerous non-pathological conditions, primarily artifacts, also cause hyperintensity.
  • Artifacts represent a significant source of potential misdiagnosis.

Conclusions:

  • Understanding the differential diagnosis of FLAIR hyperintensity is critical.
  • Distinguishing between true pathology and artifacts is essential for accurate brain MRI interpretation.
  • Awareness of artifactual causes can prevent unnecessary patient anxiety and interventions.