NotesLymphovascular invasion (LVI) indicates the presence or absence of tumor cells in lymphatic channels (not lymph nodes) or blood vessels within the primary tumor as noted microscopically by the pathologist. LVI includes lymphatic invasion, vascular invasion, and lymphovascular invasion. See the [SEER Program Coding Manual](https://seer.cancer.gov/tools/codingmanuals/index.html) for coding instructions.
NAACCR ItemNAACCR #1182
|0||Lymph-vascular Invasion stated as Not Present|
|1||Lymph-vascular Invasion Present/Identified|
|2||Lymphatic and small vessel invasion only (L)|
|3||Venous (large vessel) invasion only (V)|
|4||BOTH lymphatic and small vessel AND venous (large vessel) invasion|
|9||Unknown/Indeterminate/not mentioned in path report|