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Hypersensitivity pneumonitis producing a BOOP-like reaction: HRCT/pathologic correlation.
I Herráez1, M Gutierrez, N Alonso
1Department of Radiology, Hospital de León, León, Spain. inmaho@latinmail.com
Journal of Thoracic Imaging
|February 6, 2002
Summary
This study details a rare hypersensitivity pneumonitis case. High-resolution CT revealed distinct nodules with ground-glass halos, indicative of organizing pneumonia, a novel presentation.
Area of Science:
- Pulmonary Medicine
- Radiology
- Immunology
Background:
- Hypersensitivity pneumonitis (HP) is an immune-mediated lung disease.
- Typical CT findings include centrilobular nodules and ground-glass opacities.
- Bronchiolitis obliterans with organizing pneumonia (BOOP) is a distinct clinicoradiological pattern.
Observation:
- An unusual case of HP is presented.
- High-resolution computed tomography (HRCT) demonstrated large, sharply defined nodular opacities.
- Many nodules exhibited a surrounding halo of ground-glass attenuation.
Findings:
- The observed HRCT features were attributed to extensive bronchiolitis obliterans with organizing pneumonia (BOOP).
- This nodular presentation with halo signs is previously undescribed in hypersensitivity pneumonitis.
- The findings suggest a potential overlap in imaging patterns between HP and BOOP.
Implications:
- This case expands the spectrum of imaging findings in hypersensitivity pneumonitis.
- Radiologists should consider HP in the differential diagnosis of nodular lung opacities with halo signs.
- Further research may elucidate the specific pathogenetic mechanisms linking HP and BOOP in such presentations.