While it's unclear where Wembanyama's clot is located in the shoulder, deep vein thrombosis (DVT) occurs when a blood clot (thrombus) forms in one or more of the deep veins in the body:

The basketball star will miss the rest of the NBA season due to a deep vein thrombosis in his right shoulder. Nine years ago, the issue ended the career of perennial All-Star Chris Bosh.

Elite athletes have a higher risk of a rare type of blood clot that affects the arms because of their high muscle mass, experts say.