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The lower respiratory tract is anatomically composed of several vital structures, including the larynx, trachea, bronchial tree, alveoli, lungs, and pleurae. Each component has a specific function, and all are intricately connected to ensure efficient respiration.
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Anatomy of Respiratory System I: Upper Respiratory Tract01:29

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The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
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IgG4-related respiratory disease.

Shoko Matsui1

  • 1a Health Administration Center , University of Toyama , Toyama , Japan.

Modern Rheumatology
|November 27, 2018
PubMed
Summary

IgG4-related respiratory disease (IgG4-RRD) presents subtly in the chest, often found during evaluations for IgG4-related diseases elsewhere. Developing clear diagnostic criteria is crucial for accurate identification and management of this condition.

Keywords:
IgG4-related diseaseIgG4-related respiratory diseasediagnostic criterianonspecific interstitial pneumoniapulmonary manifestations

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Area of Science:

  • Pulmonology
  • Rheumatology
  • Pathology

Background:

  • IgG4-related diseases (IgG4-RDs) encompass conditions like autoimmune pancreatitis and Mikulicz disease.
  • Intrathoracic manifestations of IgG4-RD are termed IgG4-related respiratory disease (IgG4-RRD).
  • IgG4-RRD often lacks distinct symptoms and is discovered during investigations for extra-thoracic IgG4-RD.

Purpose of the Study:

  • To highlight the characteristics of IgG4-related respiratory disease (IgG4-RRD).
  • To emphasize the need for diagnostic criteria for IgG4-RRD.
  • To differentiate IgG4-RRD from other intrathoracic conditions.

Main Methods:

  • Review of clinical presentations of IgG4-RRD.
  • Analysis of radiological findings in IgG4-RRD.
  • Pathological examination of IgG4-RRD tissues.

Main Results:

  • IgG4-RRD presents with diverse thoracic lesions, including masses, nodules, and infiltrates, often spread via lymphatic routes.
  • Elevated serum IgG4 and lymphoplasmacytic infiltrates are characteristic but not exclusive to IgG4-RD.
  • Differential diagnosis is essential to distinguish IgG4-RRD from conditions like Castleman disease and malignancies.

Conclusions:

  • IgG4-RRD is an intrathoracic manifestation of IgG4-RD, frequently asymptomatic.
  • Accurate diagnosis requires integrating clinicoradiological and pathological findings.
  • Establishing definitive diagnostic criteria for IgG4-RRD is imperative for patient care.