Feasibility of Endoscopic Submucosal Dissection: A New Technique for En Bloc Resection of a Large Superficial Tumor in the Colon and Rectum
Table 1
Clinicopathologic characteristics of 137 superficial colorectal tumors.
Age, mean (range), years
66.8 (40–90)
Men, Women
79, 58
Tumor Size, mean (range), mm
29.2 (20–150)
Tumor location
n
Cecum
10
Ascending Colon
26
Transverse Colon
32
Descending Colon
5
Sigmoid Colon
28
Rectum
36
Tumor Morphology
n
Laterally Spreading Tumors (LST)
100
Non LST
37
Operation time, average (range), minutes
79.2 min. (20–100)
En bloc resection rate, %
89.1% (122/137)
Complete resection rate, %
85.4% (117/137)
Endoscopic piecemeal resection (EPMR), %
7.3% (10/137)
Suspended, %
3.6% (5/137)
Complications
Perforation, %
3.6% (5/137)
Postoperative hemorrhage, %
3.6% (5/137)
Histopathological Diagnosis
Adenoma
40
Adenocarcinoma
97
Intramucosal
89
Submucosal (SM) invasion
8
SM1
3
SM2
5
Complete resection: En bloc resection with tumor-free lateral and vertical margins. SM1: submucosal invasion less than 1000 μm from the muscularis mucosae. SM2: submucosalinvasion 1000 μm or more fromthe muscularis mucosae.
