Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pathological degree of carcinoma invasion of venous wall. a, Grade 0, no invasion (× 40); b, grade 1, tunica adventitia invasion (× 100); c, grade 2, tunica media invasion (× 100); d, grade 3, tunica intima invasion (× 100). Black arrow indicates cancer cells
