Ultrasound examination of the sigmoid colon in collagenous colitis. The sigmoid colon is normal size but the layers are more pronounced. 1 = lamina muscularis; arrow = submucosa; and 2 = mucosa. The distance between the crosses is 1.7 mm.
Courtesy of C F Dietrich, MD and Wolfgang F Caspary, MD.
Graphic 79824 Version 2.0
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