Lakers' Pau Gasol may have slight tear in hamstring

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 expected Tuesday. 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 expected Tuesday.