Diagnostic value of MRI in tuberculous meningitis

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C Tayfun1, T Uçöz, M Taşar

  • 1Department of Diagnostic Radiology, Gülhane Military Medical Academy and Medical School, Ankara, Turkey.

European Radiology
|January 1, 1996
PubMed

Insights

Magnetic resonance imaging (MRI) aids in diagnosing tuberculous meningitis by revealing thick meningeal enhancement. This study highlights key MRI features, including intra-axial tuberculomas with characteristic T2-weighted hypointensity.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Radiology

Background:

  • Tuberculous meningitis (TBM) is a severe form of extrapulmonary tuberculosis affecting the central nervous system.
  • Accurate and timely diagnosis of TBM is crucial for effective treatment and improved patient outcomes.
  • Magnetic resonance imaging (MRI) plays a vital role in the neuroimaging of central nervous system infections.

Purpose of the Study:

  • To evaluate the utility of MRI in diagnosing tuberculous meningitis.
  • To identify specific MRI findings associated with tuberculous meningitis and intracranial tuberculomas.
  • To correlate MRI features with clinical and cerebrospinal fluid (CSF) findings in patients with suspected TBM.

Main Methods:

  • Retrospective analysis of 15 patients with clinical and CSF-confirmed tuberculous meningitis.
  • Evaluation using magnetic resonance imaging (MRI) including T1-weighted and T2-weighted sequences.
  • Post-contrast T1-weighted images were acquired after intravenous administration of gadolinium diethylenetriamine pentaacetic acid (Gd-DTPA).

Main Results:

  • Tuberculous meningitis was diagnosed in 11 out of 15 patients based on characteristic thick meningeal enhancement on postcontrast T1-weighted MRI.
  • Intra-axial tuberculomas were identified in 8 patients, with 2 cases presenting tuberculomas without MRI evidence of meningitis.
  • Tuberculomas demonstrated ring or nodular enhancement on postcontrast T1-weighted images and a significant hypointense appearance on T2-weighted images.

Conclusions:

  • MRI, particularly with Gd-DTPA contrast, is a valuable tool for diagnosing tuberculous meningitis, showing characteristic meningeal enhancement.
  • The presence of intra-axial tuberculomas, often appearing hypointense on T2-weighted images, is an important finding in TBM.
  • MRI findings can aid in differentiating TBM from other neurological conditions and guide therapeutic decisions.

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