What is the definition of Cases Veins?

"Cases veins," my friend, is a playful twist on the medical term 'enous' (related to veins). Now, imagine this: "The detective's quest for the missing case veins led him down a labyrinth of twisted, dark tunnels, where every shadow seemed to be hiding a potential artery." That's right, my friend - we're talking about the intricate network of blood vessels that keep our bodies ticking, even if it's a bit spooky. But let's keep it PG-13, okay? "The detective's quest for the missing case veins was so intense, it turned his trench coat into a blood-red labyrinth!"