Fig. 2From: Preoperative prediction of peripancreatic vein invasion by pancreatic head cancerPathological 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 cellsBack to article page