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Bronchiolar disorders: classification and diagnostic approach.

Venerino Poletti¹, Ulrich Costabel

¹Dipartimento di Malattie dell' Apparato Respiratorio e del Torace, Ospedale G. B. Morgagni, Forlì, Italy.

Seminars in Respiratory and Critical Care Medicine

|August 10, 2005

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Bronchiolitis involves inflammation and tissue changes in the small airways. Understanding its varied causes and distinct imaging patterns is key for accurate diagnosis and patient care.

Area of Science:

Pulmonary Medicine
Pathology
Radiology

Background:

Bronchiolitis is characterized by inflammation and mesenchymal tissue in the bronchioles, leading to diverse clinical and histopathologic presentations.
The varied manifestations of bronchiolitis stem from differing distributions of cellular and mesenchymal components.
Clinical classification categorizes bronchiolitis by cause (e.g., toxic fume inhalation, infections, autoimmune diseases) or clinical setting.

Purpose of the Study:

To present a comprehensive overview of bronchiolitis, encompassing its classification and diagnostic approaches.
To correlate histopathologic findings with high-resolution computed tomographic (HRCT) imaging patterns.
To guide the diagnostic strategy for patients with suspected bronchiolitis.

Main Methods:

Related Experiment Videos

Review of clinical classifications based on etiological factors and clinical settings.
Description of morphological classifications based on distinct histologic patterns.
Evaluation of high-resolution computed tomographic (HRCT) findings and their correlation with histopathology.

Main Results:

Bronchiolitis exhibits four main histologic patterns: cellular, inflammatory polyps, constrictive/cicatritial, and peribronchiolar fibrosis/metaplasia.
HRCT findings associated with bronchiolitis include centrilobular opacities, ground-glass attenuation, consolidation, mosaic perfusion, and mixed patterns.
These HRCT patterns show good correlation with underlying histopathologic changes.

Conclusions:

Bronchiolitis presents a spectrum of disease influenced by its underlying cause and specific histologic features.
HRCT is the optimal imaging modality for evaluating suspected bronchiolitis, revealing characteristic patterns that align with histopathology.
A structured diagnostic approach integrating clinical, histopathologic, and imaging data is essential for managing bronchiolitis.