What does gastric ulcer A1 mean?

Under the microscope, the severity of gastric ulcer can be divided into A, H and S stages. A stage is the active stage of ulcer, A1 stage is obvious swelling around ulcer, no regenerative epithelial cells proliferate, A2 stage is light swelling around ulcer, there are regenerative epithelial cells, and the relative condition is better. H stage is the healing stage, or the city thin moss stage. H1 moss is thin, with red and raised upward. The second stage ulcer shrinks, which is small status or punctate. S stage scar stage forms red scar in the first stage and white in the second stage.