Notes**Note 1:** Physician statement of microscopically confirmed perineural invasion can be used to code this data item when no other information is available. **Note 2:** Code the presence or absence of perineural invasion by the primary tumor as documented in the pathology report.
NAACCR ItemNAACCR #3909
|0||Perineural invasion not identified/not present|
|1||Perineural invasion identified/present|
|8||Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 8 may result in an edit error.)|
|9||Not documented in medical record Pathology report does not mention perineural invasion Cannot be determined by the pathologist Perineural invasion not assessed or unknown if assessed|