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Updated: Oct 3, 2026

Lung CT Segmentation to Identify Consolidations and Ground Glass Areas for Quantitative Assesment of SARS-CoV Pneumonia
Published on: December 19, 2020
Radiology of pneumonia
1Department of Radiology, University of Louisville, Louisville, Kentucky, USA.
Abstract:
Infection of the lower respiratory tract, acquired by way of the airways and confined to the lung parenchyma and airways, typically presents radiologically as one of three patterns: (1) focal nonsegmental or lobar pneumonia, (2) multifocal bronchopneumonia or lobular pneumonia, and (3) focal or diffuse "interstitial" pneumonia. These patterns can be useful in identifying the etiological organism in the appropriate clinical setting. To serve the purpose of this article, these patterns are used as the primary method of classification of pulmonary infections caused by different organisms. Mycobacterial and fungal pulmonary infections are reviewed separately because of their wide range of radiographic appearance that depend on the stage of the disease at presentation. This article discusses the clinical and radiographic features of the most common causes of pneumonia, primarily in the adult population of the United States.
Insights
This study classifies lower respiratory tract infections based on three radiological patterns: lobar pneumonia, bronchopneumonia, and interstitial pneumonia. These patterns aid in identifying the causative organism for common adult pneumonias in the US.
Area of Science:
- Pulmonology
- Infectious Diseases
- Radiology
Background:
- Lower respiratory tract infections, including pneumonia, manifest radiologically in distinct patterns.
- Understanding these patterns is crucial for diagnosing the causative agents of pulmonary infections.
- This classification aids in the etiological diagnosis of pneumonia in clinical settings.
Purpose of the Study:
- To classify pulmonary infections based on three primary radiological patterns.
- To correlate radiological findings with specific etiological organisms.
- To review the clinical and radiographic features of common pneumonia causes in US adults.
Main Methods:
- Classification of pulmonary infections using three radiological patterns: focal nonsegmental/lobar pneumonia, multifocal bronchopneumonia/lobular pneumonia, and focal/diffuse interstitial pneumonia.
- Separate review of mycobacterial and fungal pulmonary infections due to their varied radiographic presentations.
- Focus on clinical and radiographic features of common pneumonia causes in the adult US population.
Main Results:
- Radiological patterns (lobar, bronchopneumonia, interstitial) serve as a primary classification method for pulmonary infections.
- These patterns can help identify the etiological organism in specific clinical contexts.
- Mycobacterial and fungal infections present a wide range of radiographic appearances depending on disease stage.
Conclusions:
- The three radiological patterns provide a useful framework for classifying lower respiratory tract infections.
- Radiological pattern recognition aids in etiological diagnosis of pneumonia.
- This approach facilitates the understanding of common pneumonia etiologies in the United States adults.
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