What is the condition described by a blood clot in a deep vein, usually in the leg?

• A. Pulmonary embolism
• B. Deep vein thrombosis
• C. Aortic aneurysm
• D. Varicose veins

Answer: (B)

This question tests understanding of a blood clot that forms in a deep vein, typically in the leg. The condition is deep vein thrombosis—DVT—where a clot develops in the deep venous system of the leg. It can cause symptoms like leg swelling, warmth, and tenderness, though some cases are without obvious signs. A key point is that DVT is important because a piece of the clot can break off and travel to the lungs, leading to a pulmonary embolism, which is a serious complication.

Pulmonary embolism isn’t where the clot forms; it’s a potential consequence of a DVT when the clot migrates to the lungs. Aortic aneurysm is a dilation of the aorta, not a leg vein clot. Varicose veins involve enlarged superficial veins due to valve problems, not a deep venous clot. So the description of a blood clot in a deep vein, usually in the leg, points to deep vein thrombosis.