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Related Concept Videos

Amnesia01:13

Amnesia

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Amnesia is a condition marked by long-term memory loss, which impairs the ability to recall past events or create new memories.
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
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Dissociative Amnesia01:21

Dissociative Amnesia

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Dissociative amnesia is a complex psychological condition that manifests as an inability to recall personal information, often tied to traumatic or stressful events. Unlike general amnesia, individuals with this condition retain the ability to perform routine activities and procedural tasks, such as operating a phone or navigating public transportation, yet experience profound gaps in autobiographical memory. These lapses may encompass significant life events, such as suicide attempts or...
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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Global Climate Change01:50

Global Climate Change

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
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Related Experiment Video

Updated: Feb 11, 2026

Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
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Transient global amnesia: Diffusion MRI findings.

Tarun P Jain1, Ronak Patel2, Yash Gawarikar2,3

  • 1Universal Medical Imaging, Canberra, Australia.

The Indian Journal of Radiology & Imaging
|April 26, 2018
PubMed
Summary
This summary is machine-generated.

Diffusion Weighted Imaging (DWI) MRI reveals characteristic punctate foci in the hippocampus for Transient Global Amnesia (TGA) patients. These findings on routine stroke MRI protocols can aid in diagnosis and workflow efficiency.

Keywords:
Amnesiadiffusion MRIhippocampusneuroimagingtransient global amnesia

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Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • Transient Global Amnesia (TGA) is a neurological condition characterized by temporary memory loss.
  • Accurate MRI findings are crucial for diagnosing TGA and differentiating it from other neurological events.

Purpose of the Study:

  • To identify and describe specific MRI findings in patients diagnosed with Transient Global Amnesia (TGA).
  • To evaluate the utility of Diffusion Weighted Imaging (DWI) sequences in detecting these abnormalities.

Main Methods:

  • Retrospective analysis of MRI scans from 12 patients with a clinical diagnosis of TGA.
  • Brain MRI was performed using 3T and 1.5T scanners.
  • Diffusion Weighted Imaging (DWI) sequences were acquired at various B values (1000 and 2000 s/mm²).

Main Results:

  • 11 out of 12 patients exhibited punctate foci of restricted diffusion within the hippocampus.
  • The majority of abnormalities were observed in the left hippocampus.
  • Higher B-value DWI (2000 s/mm²) demonstrated improved sensitivity in detecting these hippocampal foci in some cases.

Conclusions:

  • Typical MRI findings in TGA include punctate foci of restricted diffusion in the hippocampus on DWI.
  • Routine stroke MRI protocols, including DWI, can detect these characteristic findings.
  • Identifying these abnormalities on standard protocols can streamline diagnostic workflow and potentially avoid repeat scans.