We observed gastric erosions with an electronic endoscope (TV-Endoscope) and divided the healing process into five stages (A, H, R 1, R 2 and R 3), according to the presence or absence of black or white base, edema and reddening (Table 1). In addition, we studied the frequency at each stage of the erosions both on the fundic and pyloric gland mucosa (Table 2). The difference between these ... [Show full abstract] frequencies on two types of gastric mucosa was statistically significant at <0.01 level. The erosions at healing (H) stage on the pyloric gland mucosa showed higher frequency than that at active (A) stage, but on the fundic gland mucosa the frequency at A stage was higher than that at H stage. On the other hand, at R 1 and R 2 stages the frequencies were similar on both gland mucosa. The frequencies at R 3 stage were 35% and 5% on the fundic and pyloric gland mucosa, respectively, and there was a significant difference between them. The erosions at this stage on the fundic gland mucosa usually showed depression and were, therefore, easily detected. We also studied the minute structure such as gastric pit and sulculus, on the surface of gastric erosions at each stage, and found that they were divided into two patterns. The one resembled the surface structure of the surrounding normal mucosa, the other was spindle-like or palisade-like pattern similar to that found during the healing process of gastric ulcer. It appears that the former corresponds to the shallow erosion and the latter is the deeper erosion of which the mucosal defect reaches the muscularis mucosa and the regenerative mucosa arises from the surrounding mucosa and extends to the center of the erosion like gastric ulcer. The frequencies of the erosions with the spindle-like or palisade-like regenerated epithelium were 10 to 25% at H and R 1 stages on the fundic and pyloric gland mucosa. © 1989, Japan Gastroenterological Endoscopy Society. All rights reserved.