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The Japan Gastroenterological Endoscopy Society classification system based on visual and endosonographic features
| Tumour type | Visual and endosonographic features |
|---|---|
| Type I | Polypoid or protuberant |
| Ip | Pedunculated |
| I (ps)/(sp) | Subpedunculated |
| Is | Sessile |
| Type II | Flat |
| IIa | Superficial elevated |
| IIb | Flat |
| IIc | Flat depressed |
| Type III | All ulcerated |
| Type IV | Lateral spreading |
