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Adopting the classification system for gastric tumors, we did find histologically "de novo" fibrosis of the submucosal layer for LST-NG (2 pF2 and 9 pF1 of 16 lesions) and also for LST-G (2 pF2 and 7 pF1 of 16 lesions).
The mean (SD) length of LST-Gs measured on a straight line was 17.28 mm (4.33) and 13.82 mm (2.84) for LST-NGs.
Firstly, the muscularis mucosae of LST-NGs were almost flatwithout the submucosal protrusions that were observed in the majority of LST-Gs (Figure 5).
In this sense, we found that while the muscularis mucosae of LST-Gs was irregular due to the presence of submucosal protrusions it was almost lineal in LST-NGs.
We found that the granular portion of LST-Gs has that pattern of blood supply whereas LST-NGs were supplied by more uniformly distributed small caliber vessels.
Flexknife Flushknife group, n (%) group, n (%) Number of patients 26 23 Number oflesions 26 25 Excluded lesions after allocation 2 1 Number of analyzed lesions 24 24 Median age (range, years old) 68 (51-86) 68 (47-87) Sex Men 16 (67) 9 (38) Women 8(33) 15 (62) Location of the lesions Rectum 7(29) 6(25) Colon 17 (71) 18 (75) Tumor type Protruded or LST-G 19 (79) 19 (79) LST-NG or lesions with 5(21) 5(21) fold convergence Median estimated tumor 27.5 (20-50) 30 (20-60) size (range, mm) Endoscopist y.t.
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