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J Korean Soc Radiol. 2011 Apr;64(4):341-350. English. Original Article.
Choi SH , Kang EY , Kim JS , Kim YK , Woo OH , Yong HS , Oh YW .
Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
Department of Laboratory Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.

PURPOSE: To assess the frequency of radiologic abnormalities and investigate the radiologic findings of patients with a pandemic (H1N1) 2009 virus infection at a University hospital in Seoul, Korea. MATERIALS AND METHODS: In November 2009, 9,427 patients were tested for pandemic (H1N1) 2009 virus and 3,849 (41%) were positive. Among them, only 338 (9%) underwent chest radiographs and 13 (0.3%) received chest CT. Two radiologists retrospectively reviewed all the radiologic images. RESULTS: Among the 338 patients, 287 (85%) were normal and 51 (15%) showed abnormalities. The frequency of abnormalities was significantly higher in children (41/212=19%) than in adults (10/126=8%) (p=0.005). Of them, 42 (82%) patients had airspace pneumonia, whereas the remaining patients showed a bronchopneumonia pattern. Unilateral (82%) involvement was more common than bilateral (18%) involvement. Among patients who received chest CT, 12 (92%) showed abnormalities, with bilateral (67%) and random (75%) involvement being more common. Ground-glass opacity (67%) and centrilobular nodules (58%) were the more common CT findings. CONCLUSION: Only a small number of patients were critically ill enough to undergo further radiologic evaluation as a result of pandemic (H1N1) 2009 virus infection, and most patients had normal chest radiographs. Unilateral airspace pneumonia was the most common abnormality in patients infected with pandemic (H1N1) 2009 virus.

Copyright © 2019. Korean Association of Medical Journal Editors.