What is tendinitis? What does tendonitis look like in an MRI?

Still waiting on word on who will be the starter for the Mets on Sunday - it may be Nelson Figueroa, in which case I told my buddy Tubby that we have to sing, bugs Bunny opera-style Figaro! Figaro! Figaro!  Anyway, it could still be Mike Pelfrey who doesn't seem concerned about his diagnosis of tendinitis.  So what is tendonitis anyway?  I asked my cousin, who is an out-of-market Mets fan in the Washington, D.C. area who just happens to be a PT.  Here's what he said: 

 

"...looking at an MRI is very interesting because of the details.  They show everything from muscles, tendons, ligaments, bones in a black or white picture.  Problems usually show up in a brighter contrast, usually white.  Tendinitis is swelling in the tendon so you will usually see a bright white color around the affected tendon, or the tendon will appear enlarged."

 

So there you go!