Gastric adenocarcinoma is the fifth most common cancer worldwide and the third leading cause of death. The major risk factors include Helicobacter pylori infection, genetic factors, environmental factors, and atrophic gastritis. Gastric remnant cancer is gastric carcinoma that develops in the remnant stomach more than five years after distal gastrectomy for benign disease, incidence ranging from 1% to 8%. However, gastric carcinoma after loop gastro-jejunostomy without gastric resection for benign etiology is rare. We report a case of a 45-year-old lady with gastro-jejunostomy without gastric resection done in childhood, presenting with adenocarcinoma at the anastomotic site after 35 years.