The ulcer crater is still visible, but the margins become sharper and the diameter of the defect shrinks to about half or two-thirds of the A1 stage. Regenerating epithelium (new skin) starts appearing at the edges.
Developmental epidermal and dermal defects
The Sakita-Miwa classification is a fundamental endoscopic tool used in gastroenterology to categorize the life cycle of a gastric ulcer. Established by Japanese researchers Sakita and Miwa, this system provides a standardized language for clinicians to describe whether an ulcer is in an active state, a healing state, or a scarring state. By breaking down the healing process into six distinct stages, it allows doctors to monitor patient progress, evaluate the effectiveness of treatments, and predict the risk of recurrence or complications. Structure of the Classification sakitamiwa classification
The ulcer base is covered with a thick white slough. The surrounding mucosa is intensely swollen (edematous) and red. No regenerative epithelium (new skin) is visible. A2 (Active-2):
Since its introduction in 1970, the Sakita-Miwa classification has become a cornerstone of gastrointestinal endoscopy, providing a practical and objective method for tracking ulcer healing. Its strength lies in its simplicity: by observing a few key characteristics—the presence of edema, the appearance of regenerating epithelium, the extent of white coating, and the nature of scar tissue—an endoscopist can accurately determine the ulcer's stage. This reliable framework is essential for clinical decision-making, from selecting appropriate therapies to designing rigorous clinical trials. Ultimately, the Sakita-Miwa classification ensures that clinicians worldwide can speak a common language when managing one of the most common gastrointestinal conditions, leading to more effective and consistent patient care. The ulcer crater is still visible, but the
However, in mainstream taxonomy (biology), medical classification (ICD/DSM), video game lore, anime/manga, or known fictional universes.
The ulcer is at its peak activity. It is characterized by a thick white-plaque coating (slough), discrete margins, and significant surrounding edema. Established by Japanese researchers Sakita and Miwa, this
Surrounding edema begins to subside; the "lip-like" sign is less prominent, and the ulcer margins become more cleanly defined. H1
The system classifies ulcers based on visual changes during upper gastrointestinal endoscopy.
The is a widely accepted endoscopic staging system used to assess the healing process of peptic ulcers, particularly gastric ulcers. Developed to provide a standardized, objective language for endoscopists, this system plays a crucial role in clinical practice and research for tracking ulcer progression from active inflammation to scar formation.
While the Sakita-Miwa system is the most widely used for peptic ulcer disease, other classification systems exist. It is important to distinguish it from these other tools: