Celtics rookie Jayson Tatum left in the second quarter of the Celtics 106-97 victory over the Lakers on Wednesday night with right ankle soreness. After the game, Tatum was put into a walking boot as a precautionary measure. Coach Brad Stevens said X-Rays on the rookie's ankle were negative—there is no break nor fracture, which is good news. However, he also had an MRI, and those results will go a longer way in determining the nature and extent of the injury. "He just has, we're hoping, a soft tissue injury in the ankle joint, which can sometimes take a while. We'll have a better feel of that when we get the images back today." A soft tissue injury wouldn't show up on an X-Ray, which scans for abnormalities in bones. MRIs, on the other hand, shed light on soft tissue injuries.