What percentage of untreated calf-vein thrombosis is believed to propagate to a proximal level?

The correct percentage of untreated calf-vein thrombosis that is believed to propagate to a proximal level is indeed in the range of 15-20%. This statistic is significant because understanding the risk of propagation helps clinicians assess the potential complications of deep vein thrombosis (DVT).

Calf-vein thrombosis typically refers to the formation of clots in the veins of the calf, which can be less severe than thrombosis occurring in the proximal veins (e.g., popliteal vein, femoral vein, or iliac vein). However, untreated calf-vein thrombosis can evolve into more serious conditions, such as pulmonary embolism, when clots dislodge and travel to the lungs.

Recognizing the 15-20% range highlights the importance of prompt diagnosis and management of calf-vein thrombi to minimize the risks associated with potential clot propagation. This statistic informs clinical guidelines and decision-making around treatment options, including the use of anticoagulation therapy or intervention to prevent the development of more significant thrombotic events.