1811 chronic duodenal ulcers were found amount 1320 patients. These ulcers were classified into four groups, Pyloric (105), Bulbar (953), Apical (723), and Post-Bulbar (30). In 68.3% of cases the ulcer was single and in 31.4% were multiple. 45.8% of ulcers were on the anterior wall, 26.4% on the posterior wall, 26.4% on the lesser curve side and 3.7% on the greater curve side of the duodenum.
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