The Spurs phenom suffered a season-ending injury. A physician explains what deep vein thrombosis is, its causes and treatment, and Wembanyama's likely prognosis.

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