Has a bulging disc according to Sully: http://blogs.chicagosports.chicagotribu ... _hardball/
By Paul Sullivan
"An MRI on Derrek Lee's neck on Sunday confirmed the bulging disc but ruled out any danger of a long-term injury that would affect his playing career.
Lee was examined by team physician Stephen Gryzlo, after incurring back spasms last Tuesday at Wrigley Field while going back to a fly ball down the right field line. He's been out of the lineup since, and was sent home on Sunday from Milwaukee.
The Cubs will not place Lee on the disabled list, and expect him to return to the starting lineup either Tuesday night or Wednesday against San Diego."