Blood clots not in t: Effusion is fluid build up in the knee or any other space in the body. This can be from inflammation, which your mom likely has. (hot joint) or blood if a torn ligament, or rarely pus+ fluid, in case of an infected joint. Blood clots generally form in the calf veins, pelvic veins or less commonly in the arm veins. The danger is that the clot can telescope up and through the heart into the lungs.
Answered 1/19/2014
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See answer: Knee xrays do not characterize the veins. Ultrasound would be best to identify a lower extremity vascular thrombus (blood clot).
Answered 9/28/2016
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