A1.
Gross classification of gastric cancer
| Type | Description |
| Gross classification of early gastric cancer (Paris classification) | |
| Protruded type (0−I) | Type 0−I is subcategorized to Type 0−Ip for pedunculated growth and Type 0−Is for sessile growth. |
| Superficial type (0−II) | Type 0−II is subcategorized into Type 0−IIa for slightly elevated growth, Type 0−IIb for flat growth, and Type 0−IIc for slightly depressed growth. According to the elevation/depression proportion, the lesions with both superficial elevation and depression are classified into Types IIc + IIa for the elevated area in a depressed lesion and Types IIa + IIc for a depressed area in an elevated lesion. |
| Excavated type (0−III) | Lesions with both excavation and superficial excavation are classified into Type III + IIc for a large excavated lesion in a depressed zone and Type IIc + III for a small excavated zone in a depressed lesion, according to the proportion of excavation and superficial excavation. |
| Gross classification of advanced gastric cancer (Borrmann classification) | |
| I | Polypoid |
| II | Fungating, ulcerated with sharply raised margins |
| III | Ulcerated with poorly defined infiltrative margins |
| III | Diffusely infiltrating |