Chronic diffuse infiltrative lung disease. Newer approaches

Area of Science:

• Pulmonary Medicine
• Radiology
• Pathology

Background:

• Diffuse infiltrative lung diseases (DILDs) require standardized descriptive terminology for accurate diagnosis and research.
• The International Labour Office (ILO) Classification provides a framework, but limitations exist for certain patterns.

Purpose of the Study:

• To introduce a modified ILO Classification scheme for describing diffuse infiltrative lung diseases.
• To enhance the diagnostic accuracy and communication of radiologic findings in DILDs.

Main Methods:

• A new classification scheme was developed, retaining existing ILO conventions for rounded (pqr), irregular (stu) opacities, and pleural disease.
• The scheme was expanded to include a third opacity group (xyz) for reticulonodular patterns and seven subtypes of "ground glass" (alveolar) patterns.
• The modified scheme was evaluated on 365 open biopsy-proven DILD cases, assessing radiologic diagnoses against histologic findings without clinical data.

Main Results:

• The enhanced classification system demonstrated potential in describing diverse DILD patterns.
• In 50% of cases, the top two radiologic diagnostic choices using the new scheme matched the principal histologic diagnosis.
• The system offers a quantifiable method for communication and analysis.

Conclusions:

• The modified ILO Classification provides an understandable and quantifiable system for DILD description.
• This classification serves as a valuable tool for teaching, clinical research, and epidemiologic studies in pulmonology.
• The scheme improves the correlation between radiologic interpretation and histologic diagnosis in diffuse lung diseases.