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:

Wembanyama's clot was discovered, according to The Athletic's Sam Amick, because Wembanyama had experienced low energy throughout All-Star Weekend and the days that followed. Blood clots are rare in the NBA, but they do happen, and the outcomes for players who get them can vary wildly.

More to know about the blood-clotting condition that knocked Spurs star Victor Wembanyama out for the remainder of the season.