What happened, in summary

A 49-year-old man sought evaluation for mild epigastric discomfort. Imaging and endoscopy showed a deep ulcerated lesion in the lower gastric body that looked suspicious for cancer, but repeated biopsies showed only necrosis, inflammation and regenerating tissue. Even after proton-pump-inhibitor treatment and several repeat endoscopies, the lesion persisted.

Endoscopic ultrasound later showed involvement of the stomach wall layers and focal contact with the serosa. Although another biopsy was still negative, the clinical concern for gastric cancer remained high. He eventually agreed to surgery, where a frozen biopsy confirmed malignancy.

He underwent laparoscopic distal gastrectomy with D2 lymph-node dissection. Final pathology showed moderately differentiated tubular gastric adenocarcinoma that penetrated the serosa, with lymphatic invasion but no lymph-node metastases. The ulcer surface had been replaced by regenerative epithelium, explaining why repeated mucosal biopsies had missed the cancer. He recovered well, received adjuvant chemotherapy and continued regular outpatient follow-up.