⭐Most common in GIT ✅Most common congenital intestinal atresia: Imperforate anus  ✅Most common true diverticulum: Meckel's diverticulum ✅Most common site of ischemia: Colon ✅Most common site of fistulization: Esophagus ✅Most common site of Gl Polyp: Colorectum  ✅Most common malignancy of Gl tract: Adenocarcinoma colon  ✅Most frequent cause of esophagitis: Acid reflux  ✅Most common benign tumor of esophagus: Leiomyoma ✅Most common esophageal cancer in India and worldwide: Squamous cell carcinoma ✅Most common esophageal cancer in Western countries: Adenocarcinoma ✅Most common type of chronic gastritis: Type B gastritis (Helicobacter pylori gastritis) ✅Most common malignancy of the stomach: Adenocarcinoma ✅Most common site of extranodal lymphoma: Stomach ✅Most common mesenchymal tumor of the stomach: Gastrointestinal stromal tumor (GIST) ✅Most common tumor of the small intestine/appendix: Carcinoid