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Related Concept Videos

Pulmonary Tuberculosis IV01:26

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Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
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Pulmonary Tuberculosis II01:28

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Medical management of tuberculosis (TB) patients involves a comprehensive approach that includes diagnosis, treatment, and monitoring. The specific strategies can vary depending on the type of tuberculosis (latent or active), the patient's overall health status, and other considerations.
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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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Analysis of 18FDG PET/CT Imaging as a Tool for Studying Mycobacterium tuberculosis Infection and Treatment in Non-human Primates
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Differentiating between active and latent tuberculosis with chest computed tomography.

Sébastien Bommart1, Jeremy Charriot2, Nicolas Nagot3

  • 1Department of Radiology, CHU Montpellier, avenue Doyen Gaston Giraud, 34000 Montpellier, France; PhyMedExp Inserm U1046, UMR9214 CNRS, 34000 Montpellier, France.

Diagnostic and Interventional Imaging
|June 29, 2021
PubMed
Summary
This summary is machine-generated.

Chest computed tomography (CT) is more effective than quantitative interferon-gamma release assay (IGRA) testing for diagnosing active tuberculosis in IGRA-positive individuals. The "tree-in-bud" CT pattern significantly aids in identifying active tuberculosis in low-incidence settings.

Keywords:
Interferon-gamma release testsLatent tuberculosisMultidetector computed tomographyTuberculosis

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Area of Science:

  • Radiology
  • Infectious Diseases
  • Pulmonology

Background:

  • Tuberculosis diagnosis relies on distinguishing active from latent infection.
  • Interferon-gamma release assay (IGRA) testing indicates Mycobacterium tuberculosis exposure but not necessarily active disease.
  • Accurate differentiation is crucial, especially in low-incidence settings.

Purpose of the Study:

  • To assess chest computed tomography (CT) capabilities in differentiating active from latent tuberculosis.
  • To compare the diagnostic performance of CT with quantitative IGRA testing.
  • To evaluate these methods in a low-incidence population with positive IGRA results.

Main Methods:

  • Retrospective analysis of 92 IGRA-positive patients with confirmed latent or active tuberculosis.
  • Determination of sensitivity, specificity, and accuracy for CT findings and quantitative IGRA.
  • Logistic regression used to identify CT variables associated with active tuberculosis.

Main Results:

  • Chest CT demonstrated higher accuracy than quantitative IGRA for active tuberculosis diagnosis.
  • The "tree-in-bud" pattern on CT showed high specificity (97%) for active tuberculosis.
  • Multivariable analysis revealed "tree-in-bud" as a strong independent predictor (OR 42.91) of active disease.

Conclusions:

  • Chest CT, particularly the "tree-in-bud" pattern, is superior to quantitative IGRA for identifying active tuberculosis in IGRA-positive individuals in low-incidence settings.
  • CT findings offer greater diagnostic value than IGRA spot counts for active disease detection.
  • This study highlights CT's role in refining tuberculosis diagnosis when IGRA results are positive.