Abstract
A clinicopathological study was performed of 21 lesions in 20 patients with duodenal adenoma (except in the duodenal papilla) detected on gastroscopic screening. The frequency of detection was 0.027%. The mean age of the patients was 51.0 years (range, 33-70 years), with a male-to-female ratio of 14:6. The adenomas were most frequently found in the descending part of the duodenum (94.4%), particularly on the side opposite the duodenal papilla (64.7%), and were relatively small, with a mean diameter of 7.4 mm (range, 3-20 mm). There were nine IIa type, five IIa+IIc type, three IIc type, two Is type, and two Ip type lesions. Flat,elevated or shallow, depressed lesions were common. Brownish lesions were the most common; 15 (71.4%) had a brown, 2 (9.5%) a normal, and 4 (19.0%) a reddish color. Histologically, 18 and 3 lesions were tubular adenoma and tubular villous adenoma, respectively. Fourteen patients underwent endoscopic resection, and 6 were followed up. Duodenal adenoma incidentally detected on gastroscopic screening is one of the duodenal neoplastic lesions that can be encountered, although it is rare. When a brownish, flat, elevated or shallow, depressed lesion is found in the descending part of the duodenum, duodenal adenoma should be taken into consideration.
