I think I may have been lucky, since the vein that was leaking was really big, it felt like a chord - and it protruded through the skin, so it was easy to see. It was the superficial dorsal vein I believe. Therefore, it was no mystery, to me anyway what the problem was (Only hurdle was convincing urologists that the vein was actually leaking blood out and the problem wasnt in my head since I am still a teenager, but that’s another story).
And since the vein stuck out it was easy for the surgeon to find when it came to embolizing it.
BTW I knew this was the problem vein since when I pressed on it blood stayed in the head.