Stephen Bird

I think this is a common site for a knee joint ganglion.
In fact I was just looking at some scanning being done in London and our patient had almost identical lesions in both knees.
I think they are often asymptomatic incidental findings and I suspect MRI sees them all the time.
They are not bakers cysts but arise from the poster-medial joint capsule and often sit right against the semimemb tendon and are often multiloculated and non compressible.
Mostly I see them displacing the semimemb tendon but it is possible for them to become intratendinous and remember at this level the semimemb is breaking up into several insertion slips so it might simply be between the slips.

This one would be too small and deep for it to be a clinical lump I think.


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