Schema Discriminator 1: Primary Peritoneum Tumor
This input is used for staging
Notes
**Note:** Since both omental and peritoneal gastrointestinal stromal tumors (GIST) are coded with the same ICD-O-3 topography code (C481), this data item must be used to identify the appropriate AJCC stage table.| Code | Description | Stage Table |
|---|---|---|
| 1 | Mesentery Mesoappendix Mesocolon Pelvic peritoneum Rectouterine pouch - Cul de sac - Pouch of Douglas Other specified peritoneal site |
Small Intestinal, Esophageal, Colorectal, Mesenteric and Peritoneal GIST |
| 2 | Omentum | Gastic and Omental GIST |
| 9 | Unknown or no information Not documented in medical record |
Small Intestinal, Esophageal, Colorectal, Mesenteric and Peritoneal GIST |
| <BLANK> | Primary Site is NOT C481, Discriminator is not necessary |