Per ESPN.com:

Houston Texans running back Arian Foster on Wednesday posted a picture of an MRI of his hamstring on Twitter, prompting questions about the severity of his injury and his openness about it.

"This is an MRI of my hamstring, The white stuff surrounding the muscle is known in the medical world as anti-awesomeness," he wrote, providing a link to a picture of the MRI image.

Dr. Michael Kaplan, ESPN's sports medicine expert, provided his own analysis of Foster's injury Wednesday and said that it is significant, based on the image the running back posted.

"The MRI scan tweeted by Foster demonstrates considerable muscle damage with bleeding and swelling," Kaplan said. "Treatment is conservative. Rest, physical therapy with stretching and ultrasound, and anti-inflammatory medicine will be employed. Foster will use a gradual strengthening program when he's ready. A return to the field would not be expected before three to four weeks. Premature exertion risks re-tear and longer convalescence."

The Texans told ESPN.com's John Clayton that it would have no comment on Foster's injury, and would address all team injuries next week.

Arian Foster's hamstring MRI, via Twitter

However, a source told ESPN.com that the team has questioned Foster on the wisdom of using Twitter to display his MRI image.

Foster, for his part, thought posting the pic was a good move and defended it. Regardless: Buyer beware for those of you heading into fantasy football drafts tonight. Foster could be a value pick. Or he could have a wasted year.