Dictionary Humor

On occasion I have been known to be a bit of a braniac (pause). So my uber educated doctor has me all up in my head because of a small language faupaux. My oncologist keeps referring to my cancer as "vigilant". As I am a huge nerd (albeit a sexy one, but a nerd nonetheless), this sends my imagination into a frenzy as I picture my cancer dressed up like Robin Hood doing bad deeds in the name of good. Does my cancer wear a mask like Batman and have a cool utility belt? Does it belong to a band of mutants like Wolverine and have adamantium in its bones? Or maybe my cancer is like Wonder Woman with fly bangles and an invisible plane... I know I'ma dork. I think he means to say "virulent"... but since when do I correct people??? :)