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Summer-type hypersensitivity pneumonitis: comparison of high-resolution CT and plain radiographic findings
- Source :
- American Journal of Roentgenology. 158:1223-1228
- Publication Year :
- 1992
- Publisher :
- American Roentgen Ray Society, 1992.
-
Abstract
- Summer-type hypersensitivity pneumonitis is an immunologic disease that occurs only in Japan. It is a form of hypersensitivity pneumonitis in which the clinical symptoms appear in the summer and subside spontaneously in mid autumn. The purpose of our study was to determine the CT findings in this condition, to compare the CT findings with those on chest radiographs, and to assess the variations in the CT findings over time. Accordingly, high-resolution CT scans and chest radiographs of 15 patients with summer-type hypersensitivity pneumonitis were retrospectively studied. Seven patients had sequential CT examinations 18-37 days apart. The CT scans and chest radiographs were reviewed by two observers independently. CT findings included diffuse micronodules (n = 15), slightly elevated lung density (n = 13), and patchy air-space consolidation (n = 13). In one patient, the findings on a chest radiograph were normal, while CT showed parenchymal abnormalities. In two cases, follow-up CT showed micronodular abnormalities after findings on the chest radiograph had returned to normal. Our results show that high-resolution CT findings of summer-type hypersensitivity pneumonitis include pulmonary micronodules, increased lung density, and air-space consolidation. High-resolution CT appears to be more useful than plain chest radiographs in the evaluation of pulmonary parenchymal abnormalities in this condition.
- Subjects :
- Adult
Male
Radiography
High resolution
Humans
Medicine
Radiology, Nuclear Medicine and imaging
Lung
Aged
Retrospective Studies
medicine.diagnostic_test
business.industry
Respiratory disease
General Medicine
Middle Aged
medicine.disease
Lung density
medicine.anatomical_structure
Summer-Type Hypersensitivity Pneumonitis
Female
Seasons
Tomography, X-Ray Computed
business
Chest radiograph
Nuclear medicine
Hypersensitivity pneumonitis
Alveolitis, Extrinsic Allergic
Subjects
Details
- ISSN :
- 15463141 and 0361803X
- Volume :
- 158
- Database :
- OpenAIRE
- Journal :
- American Journal of Roentgenology
- Accession number :
- edsair.doi.dedup.....b8de8b24dafd294870bddd985181807c