Abstract
Eighteen cases of serrated adenoma resected colonoscopically from 1994 to 2001 were studied, and their colonoscopic findings were discussed. Mean size of the 18 lesions was 12 mm in diameters. Twelve of the 18 lesions were elevated. Twelve of the 18 lesions were reddish, 5 were whitish and the other was the same color as normal mucosa. Pit pattern was type II in 6 lesions, type IV in 6 lesions and type IIIL in 4 lesions by magnifying colonoscopy. Five lesions were diagnosed as serrated adenoma, 10 as adenoma and 3 as hyperplasic polyp by colonoscopy. As the lesions with type IIIL or type IV pit pattern were diagnosed to be serrated adenoma or adenoma, they were resected colonoscopically. However, three of 6 lesions with type II pit pattern were whitish, and were diagnosed as hyperplasic polyp by magnifying colonoscopy. These 3 lesions were resected colonoscopically because of the larger size comparing with common hyperplasic polyps. The serrated adenoma with reddish color, type IIIL or type IV pit pattern could be diagnosed as neoplastic lesions. However, it is difficult to discriminate serrated adenoma with whitish color and type II pit pattern from hyperplastic polyp by colonoscopy.
