How would tumor involvement in small vessels be discussed on a pathology report?

Vascular: It should state if there is "lymphovascular invasion.".

LVI: Usually, this is noted as "lymphovascular invasion". Often a pathology report for a cancer surgery will have a checklist or "synoptic report" following the main diagnosis. The presence of lymphovascular invasion is not always reported on a biopsy unless it is a prominent feature.

Pathology report: Typically invasion of tumor into small (or large) blood vessels would be mentioned in the pathology report under "lymphovascular space invasion", "angiolymphatic space invasion", etc. It can be an important determinant of prognosis and the likelihood of regional or distant metastatic disease.

Angiolymphatic : Angiolymphatic invasion would be the term used to indicate that tumor has invaded into small vessels. Equivalent terms would also be lymphoangitic spread or lymphovascular invasion. Invasion into larger vessels would be referred to as venous invasion (into veins) or arterial invasion (into arterioles or arteries). Tumor present in vessels can also be described as vascular tumor emboli.