Abstract 173

HMCP appearancen biopsiesHistology
SquamousColumnarVillousOther
n = 132. Median age 46 years (range 22–78), 71(54%) female, median pouch duration 6.5 years (range 2–12). Total no. of ‘pouch years’ surveyed = 231.
K coefficient of agreement between endoscopic zone 1 and squamous epithelium; zone 2 and columnar epithelium; and zone 3 with villous histology was 0.78, 0.69 and 0.85 respectively. Sensitivity 91%, specificity 87% and accuracy 93%. There were no cases of dysplasia at the ATZ.
Zone 1 LCM5264338850
Zone 2 Kudo type I/II53142388992
Zone 3 Villous5296384823