Swelling: An effusion is a medical term for swelling. The MRI is a sensitive tool that picks up even the slightest abnormality in a given area. A small effusion is a small amount of swelling in the joint. This could be due to a number of things, from arthritis to ligament and cartilage injury.
Answered 6/10/2014
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Knee MRI: Effusion is "water on the knee". This could be benign or caused by an internal derangement (ie: cartilage tear).
Answered 6/18/2016
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