Vertebrobasilar insufficiency is a condition characterized by poor blood flow to the posterior (back) portion of the brain, which is fed by two vertebral arteries that join to become the basilar artery. Blockage of these arteries occurs over time through a process called atherosclerosis, or the build-up of plaque.
No, Portugal is not a Mediterranean country. It does, however, have a mediterranean climate, but it is not considered a mediterranean country because the south does not have the Mediterranean Sea as a coast.
Portugal is bordered by Spain on the east and north. The Atlantic  Ocean borders Portugal on the south and west.   Portugal is in southern Europe and it occupies most of the western  side coast of the Iberian Peninsular, which it shares with Spain.