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Related Concept Videos

Pleural Effusion I: Introduction01:25

Pleural Effusion I: Introduction

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Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Pleural Effusion II: Symptoms and Management01:28

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Pleural Effusion Overview
A pleural effusion is the abnormal collection of fluid between the parietal and visceral pleura layers of tissue that form the lining of the lungs and chest cavity. It can occur independently or due to surrounding parenchymal diseases, such as infection, malignancy, or inflammatory conditions.
Clinical Manifestations:
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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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Weighted Mean00:57

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While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
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Related Experiment Video

Updated: Feb 3, 2026

Local Anesthetic Thoracoscopy for Undiagnosed Pleural Effusion
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Can diffusion weighted MRI differentiate between inflammatory-infectious and malignant pleural effusions?

O Karatag1, T Alar, S Kosar

  • 1Department of Radiology, Canakkale Onsekiz Mart University School of Medicine.. okaratag17@gmail.com.

JBR-BTR : Organe De La Societe Royale Belge De Radiologie (SRBR) = Orgaan Van De Koninklijke Belgische Vereniging Voor Radiologie (KBVR)
|November 6, 2018
PubMed
Summary
This summary is machine-generated.

Diffusion-weighted MRI (DW-MRI) cannot reliably differentiate between inflammatory-infectious and malignant pleural effusions. Further research is needed to establish non-invasive criteria for diagnosing these exudative conditions.

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Area of Science:

  • Radiology
  • Oncology
  • Infectious Diseases

Background:

  • Exudative pleural effusions require accurate differentiation between inflammatory-infectious and malignant causes for appropriate patient management.
  • Non-invasive diagnostic methods are highly desirable to avoid invasive procedures.

Purpose of the Study:

  • To evaluate the efficacy of diffusion-weighted magnetic resonance imaging (DW-MRI) in differentiating inflammatory-infectious from malignant pleural effusions.
  • To identify non-invasive imaging criteria using DW-MRI for effusion characterization.

Main Methods:

  • Thirty-two patients with pleural effusions underwent DW-MRI at various b values (10, 500, 750, 1000 s/mm2).
  • Apparent diffusion coefficient (ADC) maps and signal intensity (SI) were measured.
  • Pleural fluid analysis (LDH, total protein) was performed post-MRI and correlated with imaging findings.

Main Results:

  • Statistically significant cut-off values for SI and ADC to differentiate malignant from inflammatory effusions were not identified.
  • A negative correlation between ADC values and LDH was found in the inflammatory-infectious group.
  • A positive correlation between ADC values and total protein was observed in the malignant group at specific b values.

Conclusions:

  • DW-MRI, based on current ADC and SI measurements, demonstrates significant overlap between inflammatory-infectious and malignant pleural effusions.
  • Non-invasive differentiation of these effusion types using DW-MRI alone is not currently feasible.
  • Further investigation into advanced MRI techniques may be warranted for improved diagnostic accuracy.