Innumerable studies have been made on the subject of gastrojejunal ulcer. The majority of them, however, have been concerned principally with the diagnosis and treatment of the condition, and little has been written on the pathologic findings. We are presenting the pathologic as well as the clinical features of gastrojejunal ulcer in 100 cases in which tissue showing the gastroenteric stoma and the ulcer was available. In all 100 cases, the specimens had been removed between 1932 and 1944. Two blocks were cut from each of the 100 specimens, and the sections made from these blocks were stained with hematoxylin and eosin. One block was made through the anastomotic junction extending through the ulcer, unless the size of the ulcer prohibited. The other section was made through that portion of the anastomotic ring in which no gross ulceration was present. REVIEW OF LITERATURE Walton1 in 1934 concluded on the