invazia tumorii la nivel vascular

...este mai mult o explicaţie decât o traducere exactă a termenului, dar eu aşa i-aş spune.

Vascular encasement by pancreatic cancer: correlation of CT findings with surgical and pathologic results.
On microscopic observation, tumor invasion to the portal venous systems was confirmed in 15 of 42 (35.7%) vessels, and this invasion was depicted as from CT grades 1 to 4. In arteries, tumor invasion was seen in 3 of 29 vessels (10.3%), all of which were graded as 3 or 4 by CT.

CONCLUSION: The grading system of vascular invasion should differ between arteries and veins. Involvement of the venous system exceeding one-half circumference of the vessels (grade 3 or 4) was suggestive of vascular invasion; however, this criterion was not always satisfactory for the evaluation of tumor invasion in the arterial system.
http://www.ncbi.nlm.nih.gov/pubmed/11351180