I've been suffering with knee pain for the last few months.
It's in the back of my left knee on the right and goes round into my inner knee kind of horizontally if that makes sense?
Went to the gp who said probably bakers cyst and referred me for an ultrasound. When the hospital got the referral they returned it saying that an MRI would be better. Gp can't make a direct referral for an MRI so I have been referred to the orthopaedic clinic who will have a look and decide if I need an MRI or not.
Anyway, I now have a lump at the front of my left knee, to the right of and slightly below my kneecap. My knee is bloody sore 
If I've been sitting, my knee is really stiff and painful when I get up and eases after a few steps. If I get up in the night it's stiff too - almost fell over a few nights back.
I can also feel the pain spreading - last night and this evening it's been in the grove below my kneecap.
Dr Google helpfully suggested it may be a tumor 
So just wondered - anyone had similar? Any ideas what it could be?
Oh, no locking or grinding, Gp said good range of movement but tenderness over popliteal something.
Anyone?