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[Brain Abscess]

Satoshi Umeda1, Akira Fujikawa, Kazuhiro Tsuchiya

  • 1Department of Radiology, Self-Defence Forces Central Hospital.

No Shinkei Geka. Neurological Surgery
|March 25, 2021
PubMed

Insights

Brain abscesses remain life-threatening, but advanced MRI techniques like diffusion-weighted imaging (DWI) and susceptibility-weighted imaging (SWI) help distinguish them from tumors. These methods reveal specific imaging characteristics for accurate diagnosis.

Area of Science:

  • Neurology
  • Radiology
  • Infectious Diseases

Background:

  • Brain abscesses carry significant mortality (5-32%) and complication rates (50% ventricular perforation).
  • Traditional contrast-enhanced imaging shows non-specific ring-like enhancement.
  • Distinguishing brain abscesses from necrotizing tumors is clinically crucial.

Purpose of the Study:

  • To highlight the utility of advanced MRI techniques in differentiating brain abscesses from necrotizing brain tumors.
  • To emphasize specific imaging findings for improved diagnostic accuracy.

Main Methods:

  • Utilized diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) mapping.
  • Employed susceptibility-weighted imaging (SWI).
  • Considered magnetic resonance spectroscopy (MRS).

Main Results:

  • Brain abscesses exhibit apparent diffusion restriction on DWI/ADC maps.
  • Necrotizing brain tumors typically show weak diffusion restriction.
  • The 'dual rim sign' on SWI is a highly specific indicator of brain abscess.

Conclusions:

  • Advanced MRI sequences (DWI, SWI) are vital for differentiating brain abscesses from tumors.
  • Specific findings like diffusion restriction and the 'dual rim sign' improve diagnostic specificity.
  • Accurate differentiation impacts timely and appropriate patient management.

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