図４の上行結腸で，１：粘膜上皮，２：粘膜下浮腫，３：固有筋層，４：腸管内容物であるが，粘膜下浮腫の厚さが１cm以上あり，骨盤腔内には腹水もあり（図１２：※）通常の感染性腸炎とは異なる所見である．粘膜下浮腫による壁肥厚は図３の横行結腸（T）の一部まで約15cmにわたって波及する．A：上行結腸，C：盲腸，TI：回腸末端．便培養の結果病原性大腸菌Ｏ−１５７：ベロ毒素１型（−）２型（＋）による腸炎と判明した．

文献考察：O-157
AJR Am J Roentgenol. 2001 Sep;177(3):619-23.
Imaging features of enterohemorrhagic Escherichia coli colitis.
Miller FH, Ma JJ, Scholz FJ.

OBJECTIVE: The purpose of this article is to define and illustrate the radiologic findings in patients with enterohemorrhagic Escherichia coli colitis. CONCLUSION: Although not definitive, imaging studies in conjunction with an appropriate clinical history can aid in the early diagnosis of E. coli colitis and exclude surgical conditions. CT is more sensitive than conventional radiography for detection. Contiguous involvement, including the transverse colon, was seen in all patients. Because CT is becoming routine in the initial workup of patients with acute abdominal pain, it is important for the radiologist to suggest E. coli colitis in the proper setting.PMID: 11517057（Table１）

参考文献
Radiographics. 2000 Mar-Apr;20(2):399-418.
CT evaluation of the colon: inflammatory disease.
Horton KM, Corl FM, Fishman EK.

Computed tomography (CT) is valuable for detection and characterization of many inflammatory conditions of the colon. At CT, a dilated, thickened appendix is suggestive of appendicitis. A 1-4-cm, oval, fatty pericolic lesion with surrounding mesenteric inflammation is diagnostic of epiploic appendagitis. The key to distinguishing diverticulitis from other inflammatory conditions of the colon is the presence of diverticula in the involved segment. In typhlitis, CT demonstrates cecal distention and circumferential thickening of the cecal wall, which may have low attenuation secondary to edema. In radiation colitis, the clinical history is the key to suggesting the diagnosis because the CT findings can be nonspecific. The location of the involved segment and the extent and appearance of wall thickening may help distinguish Crohn disease and ulcerative colitis. In ischemic colitis, CT typically demonstrates circumferential, symmetric wall thickening with fold enlargement. CT findings of graft-versus-host disease include small bowel and colonic wall thickening, which may result in luminal narrowing and separation of bowel loops. In infectious colitis, the site and thickness of colon affected may suggest a specific organism. The amount of wall thickening in pseudomembranous colitis is typically greater than in any other inflammatory disease of the colon except Crohn disease.PMID: 10715339