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Pleural Effusion I: Introduction

Pleural Effusion I: Introduction

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.
There are two main types of pleural effusion: transudative and exudative. They are differentiated using Light's...

Pleural Effusion II: Symptoms and Management

Pleural Effusion II: Symptoms and Management

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:

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

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...

Thoracic Aorta

Thoracic Aorta

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Related Experiment Video

Updated: Feb 13, 2026

Local Anesthetic Thoracoscopy for Undiagnosed Pleural Effusion

Local Anesthetic Thoracoscopy for Undiagnosed Pleural Effusion

Published on: November 10, 2023

Thoracic herniation secondary to pleural effusion.

Carlos Romero^1,2, Daryelle S Varon^1,3, Salim Surani⁴

¹Dorrington Medical Associates, Houston, TX, USA.

Respiratory Medicine Case Reports

|March 1, 2018

Summary

A delayed lung herniation occurred 4 years after esophageal cancer surgery due to inadequate closure, causing respiratory distress. Thoracentesis relieved symptoms, highlighting a rare complication of thoracic procedures.

Keywords:

Pleural effusion Pleural pressure Surgery Thoracentesis Thoracic herniation

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Area of Science:

Thoracic surgery
Pulmonology
Oncology

Background:

A 61-year-old male with a history of stage IV esophageal cancer presented with dyspnea and cough.
The patient had undergone distal esophageal resection four years prior to this admission.

Observation:

Chest imaging revealed a large right pleural effusion with a portion herniating between the ribs.
This presentation mimicked a thoracic hernia, a rare complication following thoracic surgery.

Findings:

Thoracentesis was performed, leading to significant improvement in the patient's dyspnea and overall condition.
The patient remained asymptomatic at the 3-month follow-up, indicating successful management of the effusion and herniation.

Implications:

Inadequate surgical closure can result in delayed lung herniation, potentially years after the initial procedure.
Video-assisted thoracoscopic surgery may be associated with a higher incidence of post-operative thoracic hernias compared to open procedures.