Ivy Chat has more on why Derrek Lee didn't return to New York last night, plus this observation:

The Derrek Lee and Mark DeRosa stuff is frustrating. Not because they are hurt. Injuries happen. The frustration comes from the nebulous diagnoses and the team playing two players short while these guys recuperate. This has all the smell of Mark Prior and Kerry Wood injuries from years past. "He's fine, he's just having dialysis and we're seeking marrow donors. But, he's fine," is the standard tripe from the Jim Hendry era.