Fig. 3.

A representative case of adenocarcinoma in which frozen section result revealed adenocarcinoma, thus achieved free lateral margin. (A) A slightly elevated gastric lesion with unclear margin in white light was noticed in antrum. (B) The lateral spread of the lesion was still obscure despite of chromoendoscopy using acetic acid and indigo carmine. (C) A frozen section biopsy was performed 3mm away from the expected lateral extent of the lesion, which was selected by the experienced endoscopist (Cho JY), because the lesions showed disconcordance in the assessment of lateral spread between two endoscopists. (D) We marked several spots about 1 cm away from the site, where frozen section biopsy was done, because frozen section revealed adenocarcinoma, well differenciated. The second biopsy revealed chronic gastritis with focal intestinal metaplasia. (E) A circumferential mucosal incision was made around the lesion including frozen section biopsy sites. (F) En bloc resection of the lesion was performed. (G) Pathologic mapping showed curatively resected adenocarcinoma (The orange line indicated the lesion - adenocarcinoma. And blue circles indicated frozen section biopsy sites).