<p><b>Deep vein thrombosis:</b> A <A href="http://www.medicinenet.com/script/main/art.asp?articlekey=22122">blood clot</a> (<A href="http://www.medicinenet.com/script/main/art.asp?articlekey=5773">thrombus</a>) in a deep <A href="http://www.medicinenet.com/script/main/art.asp?articlekey=5970">vein</a> in the thigh or leg. The clot can break off as an <A href="http://www.medicinenet.com/script/main/art.asp?articlekey=3224">embolus</a> and make its way to the lung, where ...

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