Clinical Study
Clinical Practice of Endoscopic Submucosal Dissection for Early Colorectal Neoplasms by a Colonoscopist with Limited Gastric Experience
Table 1
Patient and tumor characteristics.
| | | Total |
| | Patients’ characteristics, (%) | | | Total number of the cases | 50 | | Sex, male/female | 25/25 | | Mean age, years | 64 (range: 46–82) | | Lesions’ characteristics | | | Mean tumor size, mm | 33.1 (range: 12–70) | | Macroscopic type, (%) | | | LST-G | 18 (36) | | LST-NG | 13 (26) | | Protruded | 19 (38) | | Tumor location, (%) | | | Cecum | 1 (2) | | Ascending colon | 6 (12) | | Transverse colon | 12 (24) | | Descending colon | 5 (10) | | Sigmoid colon | 10 (20) | | Upper rectum (Ra) | 8 (16) | | Lower rectum (Rb) | 8 (16) | | Histopathology, (%) | | | Neuroendocrine tumor | 3 (6) | | Adenoma, low-grade dysplasia | 28 (56) | | Adenoma, high-grade dysplasia | 6 (12) | | Intramucosal carcinoma | 7 (14) | | Invasive carcinoma, SM1 | 1 (2) | | Invasive carcinoma, SM2 | 3 (6) | | Sessile serrated adenoma/polyp | 2 (4) |
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LST-G: laterally spreading tumors, granular; LST-NG: laterally spreading tumors, nongranular; SM1: submucosal invasion <1,000 m; SM2: submucosal invasion ≥1,000 m; Ra: rectum above reflection line; Rb: rectum below reflection line.
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