Deep vein thrombosis is a condition in which a blood clot forms in a vein, most commonly in the deep veins of the legs or pelvis. The blood clot can dislodge and travel in the blood, particularly to the pulmonary arteries.
Distal DVT (also known as isolated distal DVT, calf DVT or below‐the‐knee DVT) occurs when the blood clot develops inside the leg veins (below the knee). The extension of the clot in proximal (above the knee) veins and the migration of a clot to the lungs (PE) are the most common complications.