1994 Volume 36 Issue 11 Pages 2182-2189_1
During 24 months between January 1992 and December 1993, 83 superficial colonic neoplasms were endoscopically diagnosed in 47 out of 531 patients (8.9%) by total colonoscopy at our clinic. Forty-four of the 83 lesions (44.6%) were located in the transverese colon. Endoscopic appearance of the superficial neoplasms was classified into : ha; 57.9%, IIa+IIc ; 22.9%, IIb ;1.2%, IIc+IIa ; 9.6%, and IIc ; 8.4%. The superficial neoplastic lesions were histologically categorized into : carcinoma (3.6%), lesion with mild atypia (43.4%), moderate atypia (44.6%), severe atypia (8.4%). Among 41 patients with superficial colonic neoplasms, 21(44.7%) showed multiplicity and 26 (55.3%) had co-existing colonic adenoma of elevated type. Thirty-six patients with superficial tumors by second endoscopic examination for and, in 12 patients, 8 (66.7%) had multiple tumors and 9 (75.0%) had co-existing adenoma. The "over looked" tumors were frequently located in the ascending colon. These results suggest that careful observation is crucial for early detection of superficial colonic tumor.
