Year 2023 / Volume 115 / Number 4
Letter
Chinese dragon sign of ulcerative colitis

207-208

DOI: 10.17235/reed.2022.9154/2022

Akira Hokama, Atsushi Iraha,

Abstract
We present a case of a 17-year-old woman with ulcerative colitis (UC) presented with abdominal pain and hematochezia. A CT scan showed active bowel inflammation, presenting the Chinese dragon sign. A diagnosis of exacerbation of UC was made. This sign refers to tortuous thick-walled sigmoid colon and rectum with narrow lumen resembles the body of the dragon and hypervascularity of the involved mesenteric vessels as bright dots next to the outer wall resemble the legs and skin spikes. Although this sign is nonspecific and may appear in ischemic colitis, ischemic colitis usually does not have rectal involvement and can be differentiated from typical UC.
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References
1. Hokama A, Maruwaka S, Hoshino K, et al. The reversed question mark sign and the dragon sign of ulcerative colitis. J Gastroenterol Hepatol Res 2013;2:429-30. doi:10.6051/j.issn.2224-3992.2013.02.198
2. Xiang H, Han J, Ridley WE, et al. Chinese dragon sign: ulcerative colitis. J Med Imaging Radiat Oncol 2018;62 Suppl 1:63.
3. Ramanathan S. Chinese dragon sign: splenic artery calcification. Abdom Radiol (NY) 2019;44:2945-6.
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Hokama A, Iraha A. Chinese dragon sign of ulcerative colitis. 9154/2022


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Publication history

Received: 25/08/2022

Accepted: 27/08/2022

Online First: 12/09/2022

Published: 03/04/2023

Article Online First time: 18 days

Article editing time: 221 days


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