From www.latimes.com
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All-Star forward, sidelined for three weeks, undergoes a sonogram that indicates his injury could be more serious than the initial diagnosis of a strain. Results of a more detailed MRI exam are expect

Because his right hamstring had been slow to heal, Lakers forward Pau Gasol decided to undergo an examination, one facet of which was a sonogram that revealed he might have a slight tear.

Gasol also had an MRI test Monday, which offers a more detailed picture. The Lakers didn't have the results by the end of practice, but they could have them by today.

"It's not as sophisticated a test," Lakers spokesman John Black said about the sonogram. "That's why we are doing the MRI. It's much more sophisticated."

Gasol originally was diagnosed with a strained hamstring. He tried to practice two weeks ago, but said he aggravated it.

Gasol has been shut down for three weeks now, missing the first three regular-season games and the last six exhibition games.

He traveled with the team, which left Monday on a two-game trip for games at Oklahoma City tonight and Houston on Wednesday night. But Gasol is a not expected to play in either game.

Over the last two years, Gasol had played a lot of basketball. He played on the Lakers team that lost to the Boston Celtics in the 2008 NBA Finals and then Gasol played for Spain in the Olympics. He played in 104 games during last season's run to the NBA title and played on Spain's national team again this summer in the European Championships.