Background An 82-year-old male presented with a chief complaint of upper abdominal pain. Subsequently, a bezoar and a gastric ulcer were detected by upper gastrointestinal endoscopy. Case presentation The bezoar was dark green in color and extremely hard, having a major axis of 7 cm. After hospitalization, 500–1000 ml/day of Coca-Cola was orally administered continuously for 3 weeks. Conclusion Thereafter, the bezoar decreased in size to a major axis of 4 cm and showed a softening trend. Therefore, lithotripsy was thereafter carried out under endoscopy using forceps.
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机译：背景一名82岁的男性主诉上腹部疼痛。随后，通过上消化道内窥镜检查发现牛黄和胃溃疡。病例介绍牛黄为深绿色，非常坚硬，长轴为7厘米。住院后，连续3周每天口服500-1000 ml /天的可口可乐。结论此后，牛黄的尺寸减小至长4 cm的主轴，并呈软化趋势。因此，此后使用钳子在内窥镜下进行碎石术。
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