title: Summer-type hypersensitivity pneumonitis: comparison of high-resolution CT and plain radiographic findings.
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.
authors.affiliation: Department of Radiology, National Kinki Chuo Hospital for Chest Diseases, Osaka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Akira
authors.forename: N
authors.initials: N
authors.lastname: Kita
authors.forename: T
authors.initials: T
authors.lastname: Higashihara
authors.forename: M
authors.initials: M
authors.lastname: Sakatani
authors.forename: T
authors.initials: T
authors.lastname: Kozuka
mesh_terms: D000328:Adult; D000368:Aged; D000542:Alveolitis, Extrinsic Allergic / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012621:Seasons; D014057:Tomography, X-Ray Computed