[CT of hypersensitivity pneumonitis]

Area of Science:

• Pulmonary Medicine
• Radiology
• Immunology

Background:

• Hypersensitivity pneumonitis (HP) is an immune-mediated lung disease.
• Accurate diagnosis and monitoring of HP are crucial for patient outcomes.
• High-resolution computed tomography (HRCT) offers detailed lung imaging.

Purpose of the Study:

• To evaluate the utility of high-resolution computed tomography (HRCT) in diagnosing and characterizing hypersensitivity pneumonitis (HP).
• To identify specific HRCT findings associated with HP.
• To assess the dynamic changes of HP findings during the clinical course using HRCT.

Main Methods:

• Seven patients with clinically confirmed hypersensitivity pneumonitis underwent high-resolution computed tomography (HRCT).
• HRCT scans were analyzed for specific patterns and abnormalities.
• CT findings were correlated with the clinical course and disease activity.

Main Results:

• Key HRCT findings included a granular pattern with acino-centric distribution, increased lung haziness, multiform high-density areas, and subpleural curvilinear shadows.
• Lung haziness demonstrated the most significant fluctuation during the clinical course.
• Relapsed haziness appeared in previously affected regions, suggesting disease recurrence or chronicity.

Conclusions:

• High-resolution computed tomography (HRCT) is a valuable tool for diagnosing and monitoring hypersensitivity pneumonitis (HP).
• Specific HRCT patterns aid in characterizing HP.
• HRCT's ability to track dynamic changes, especially haziness, is important for evaluating disease activity and response to treatment.