ArticleCureus2025
A Difficult-to-Diagnose Collision Tumor in a Patient With Gastric-Type Duodenal Cancer and Gastric Cancer: A Report of a Rare Case.
Article in Cureus, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
Collision tumors, characterized by the coexistence of two distinct malignancies within the same area, are extremely rare. Herein, we report a collision tumor that was difficult to diagnose preoperatively in a patient with gastric cancer and gastric-type duodenal cancer. An 82-year-old woman with a history of melena and anemia was diagnosed with progressive gastric cancer of the gastric antrum at the lesser curvature. Part of the tumor infiltrated the pyloric ring but was not detected in the duodenal bulb within the observable range. Enhanced computed tomography revealed wall thickening from the gastric antrum up to the pyloric ring, with swelling of the lesser curvature and a subpyloric lymph node. The patient underwent a distal gastrectomy and D2 lymph node dissection for gastric cancer. Pathological findings showed gastric cancer (papillary adenocarcinoma and moderately differentiated tubular adenocarcinoma) positive for mucin 5AC (MUC5AC), and duodenal cancer (solid-type poorly differentiated adenocarcinoma > non-solid-type poorly differentiated adenocarcinoma) positive for MUC5AC and mucin 6 (MUC6), with both tumors meeting at the pyloric ring. Lymph node metastasis from gastric and duodenal cancer was also detected. No previous reports of collision tumors involving both gastric-type duodenal cancer and gastric cancer exist. In patients with gastric cancer with duodenal invasion, the possibility of duodenal cancer complications and the extent of lymph node dissection should be considered.
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