Collaborative Stage Data Set - Revised 06/11/2013 FINAL

GISTPeritoneum

CS Site-Specific Factor 10
Location of Primary Tumor

Note: Since both omental and peritoneal gastrointestinal stromal tumors (GIST) are coded with the same ICD-O-3 topography code (C48.1), this Site-Specific Factor must be used to identify the appropriate AJCC stage table.

Code	Description	Stage Table
010	Mesentery Mesoappendix Mesocolon	GISTSmallIntestine
020	Omentum	GISTStomach
030	Pelvic Peritoneum	GISTSmallIntestine
040	Rectouterine pouch Cul de sac Pouch of Douglas	GISTSmallIntestine
988	Not applicable: Information not collected for this case (If this item is required by your standard setter, use of code 988 may result in an edit error.)	ERROR
998	Other specified peritoneal site	GISTSmallIntestine
999	Unknown or no information Not documented in patient record	GISTSmallIntestine