Prediction and Treatment of Difficult Cases in Colorectal Endoscopic Submucosal Dissection
Table 2
Clinical outcomes of difficult and non-difficult groups in view of procedure time.
Difficult group (≥120 min)
Non-difficult group (<120 min)
P value
Case numbers (%)
100 (19.3%)
418 (80.7%)
Tumor size (mm), mean ± SD
<0.001
Tumor location (%) Right-sided/left-sided/rectum
43.0/18.0/39.0
50.2/20.2/29.6
NS
Morphology (%) Superficial/protruding
83.0/17.0
80.4/19.6
NS
Degree of fibrosis (%) F0/F1/F2
28.0/48.0/24.0 (28/48/24)
59.1/34.9/6.0 (247/146/25)
<0.001
The ratio of Expert/non-expert (%) (n)
37.0/63.0 (37/63)
33.7/66.3 (141/277)
NS
Procedure time (minutes), mean ± SD
<0.001
En bloc resection (%)
77.0
95.0
<0.001
Perforation (%) (n)
11.0 (11)
2.2 (9)
<0.001
Postoperative hemorrhage (%) (n)
6.0 (6)
1.4 (6)
<0.01
Histology (%) Ad/M/SM
33.0/51.0/16.0
47.8/40.8/11.4
NS
Right-sided: from cecum to transverse colon, left-sided: from descending to sigmoid colon, F0: no fibrosis, F1: mild fibrosis, F2: severe fibrosis, Ad: adenoma, M: intramucosal cancer, SM: submucosal invaded cancer, and NS: not significant.
