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:

Victor Wembanyama is expected to miss the remainder of the regular season with deep vein thrombosis in his right shoulder, the San Antonio Spurs announced Thursday. This, obviously, is not a standard sports injury.

Victor Wembanyama, the reigning NBA rookie of the year, is out for the rest of the season with deep vein thrombosis in his right shoulder.