alt=Drawing showing that moving down the body, the inferior vena cava branches into 2 common iliac veins. The common iliac veins split into the internal iliac and external iliac veins. The external iliac veins give rise to the common femoral veins. DVT and PE are the two manifestations of the cardiovascular disease venous thromboembolism (VTE). VTE can occur as DVT only, DVT with PE, or PE only. About two-thirds of VTE manifests as DVT only, with one-third manifesting as PE with or without DVT. VTE, along with superficial vein thrombosis, are common types of venous thrombosis. DVT is classified as acute when the clots are developing or have recently developed, whereas chronic DVT persists more than 28 days. Differences between these two types of DVT can be seen with ultrasound. An episode of VTE after an initial one is classified as recurrent. Bilateral DVT refers to clots in both limbs while unilateral means only a single limb is affected. DVT in the legs is proximal when above the knee and distal (or calf) when below the knee. DVT below the popliteal vein, a proximal vein behind the knee, is classified as distal and has limited clinical significance compared to proximal DVT. Calf DVT makes up about half of DVTs. Iliofemoral DVT has been described as involving either the iliac or common femoral vein; elsewhere, it has been defined as involving at a minimum the common iliac vein, which is near the top of the pelvis. DVT can be classified into provoked and unprovoked categories. For example, DVT that occurs in association with cancer or surgery can be classified as provoked. However, the European Society of Cardiology in 2019 urged for this dichotomy to be abandoned to encourage more personalized risk assessments for recurrent VTE. The distinction between these categories is not always clear.
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