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J Korean Soc Radiol. 2011 Apr;64(4):341-350. English. Original Article. https://doi.org/10.3348/jksr.2011.64.4.341
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. keyrad@korea.ac.kr
Department of Laboratory Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
Abstract

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.

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