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Gastric lymphangioma coexisting with mucosal gastric cancer: a rare case report. We describe a case of gastric lymphangioma coexisting with mucosal gastric cancer. A 76-year-old man was diagnosed with an advanced gastric cancer (cT2N0M0, Stage I) presenting a nodular protruded lesion with irregular central depression. The surgically resected specimen showed a 4 × 3 cm sessile protruded lesion in the anterior wall of the lower stomach. Histopathological examination revealed a mucosal adenocarcinoma was located immediately above the lymphangioma and was elevated by the cystic component of lymphangioma without admixture, which suggested that the two components arose separately. The mucosal adenocarcinoma was masquerading as an advanced gastric cancer due to the protrusion by the lymphangioma.