TO THE EDITOR We have read with interest the recent report by E Kayacetin and S Kayacetin of “Gastric ulcer penetrating to liver diagnosed by endoscopic biopsy since we diagnosed the duodenal ulcer which penetrated into liver similarly. This is a rather unusual case because of the fifth case in the literature and responding to medical therapy. TO THE EDITOR We have read with the interest the recent report by E Kayacetin and S Kayacetin of ”Gastric ulcer penetrating to liver diagnosed by endoscopic biopsy since we diagnosed the duodenal ulcer which penetrated into liver similarly. This is a rather unusual case because of the fifth case in the literature and responding to medical therapy.