Abstract
A histopathological examination was made on 71 cases of gastric polyp resected at the Surgical Department of Tohoku University during the last 22 years. The results obtained are as follows:
1. Of the 71 cases of gastric polyp, 41 were single, 28 were multiple cases, and two cases were so-called polyposis of the stomach. In the 69 cases excluding two polyposis, a total of 155 polyps were recognized, the macroscopic nature of which varied widely.
2. The grade of development of polyps varied from a simple mucosal hyperplasia to a typical polyp having characteristic features of adenoma or fibroadenoma. Therefore, 71 cases were classified histologically into three types and the relationship with chronic gastritis and malignant degeneration was studied.
3. Concerning the relationship between gastric polyp and chronic gastritis, 61 polyps (18 of Type I, 23 of Type II, 20 of Type III) of the 155 polyps were found not to be associated with perifocal chronic gastritis, but 94 polyps (26 of Type I, 41 of Type II, 27 of Type III) showed evidence of chronic gastritis in their vicinities. Moreover, in polyps accompanying chronic gastritis, frequent mucosal hyperplasia which is presumable for prepolypoid stage was seen on the surrounding gastric mucosa. Therefore, though it is impossible to conclude that all polyps originate from gastritis, the existence of polyps originated by the mechanism as pointed out by Konjetzny is undoubtful.
4. Malignant degeneration was observed in 13 cases (18.3 per cent) of the 71 cases. Six of these 13 cases manifested malignant degeneration limited on the superficial portion of the gastric mucosa. All of these polyps in 6 cases measured under index finger tip and attention was paid to the fact that three of these four cases had polyps of Type II, polyps of relatively early stage.
5. Nine of the 13 cases of manifest malignant degeneration were advanced cases measuring thumb tip size or over, but glandular structure in the basal region of pedicle had been relatively well preserved. Therefore, it was presumed that the cancerous tissue was originated on the superficial portion and proliferated towards the gastric lumen, showing less remarkable deep infiltration.
