From KC Johnson:

Back specialist confirmed Bulls' diagnosis of DRose. Lower back spasms. Nothing structurally wrong with back. Muscular issue. Day-to-day.

That doesn't really say much, but it does say what it isn't: nothing crazy, season ending, etc. So that's good.

As far as updates for this week's games, I expect bullcrap from Thibs and we'll find out at tipoff. Don't want the those Sacramento Kings prepared!