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Computed Tomographic Findings of Enterohemorrhagic Escherichia coli O157 Infection

An Analysis of a 7-Case Regional Outbreak

Hiraka, Toshitada MD*; Kanoto, Masafumi MD, PhD*; Sugai, Yukio MD, PhD*; Honma, Tsuguo MD, PhD; Makino, Naohiko MD, PhD; Ueno, Yoshiyuki MD, PhD; Hosoya, Takaaki MD, PhD*

Journal of Computer Assisted Tomography: May/June 2015 - Volume 39 - Issue 3 - p 406–408
doi: 10.1097/RCT.0000000000000209
Abdominal Imaging

Purpose We experienced an outbreak of enterohemorrhagic Escherichia coli (EHEC) colitis. The purpose of this study was to reveal the computed tomographic (CT) findings on EHEC colitis.

Methods The subjects were 7 patients with EHEC colitis, which was caused by eating a contaminated Japanese rice cake. Contrast CT was performed on all patients. Two radiologists evaluated the CT findings (the thickness of colon wall, the range of thickened colon, and the existence of dirty fat signs around the colon, ascites, and swelling of lymph nodes), in accordance with our PACS system.

Results Wall swelling of the proximal colon from cecum to ascending colon was noted in all patients. Small intestine lesions were not noted in any cases.

Conclusions We should consider EHEC infection as part of a differential diagnosis when the findings of severe right colitis are seen without enteritis.

From the *Department of Diagnostic Radiology, Yamagata University Faculty of Medicine; †Department of Diagnostic Radiology, Yamagata Prefectural Central Hospital; and ‡Department of Gastroenterology, Yamagata University Faculty of Medicine, Yamagata, Japan.

Received for publication August 29, 2014; accepted November 26, 2014.

Reprints: Toshitada Hiraka, MD, Department of Diagnostic Radiology, Yamagata University Faculty of Medicine, 2-2-2 Iida-nishi, Yamagata 990-9585, Japan (e-mail:

The authors declare no conflict of interest.

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