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You have 2 meniscus in your knee the medial (inside) and lateral (outside) The are c-shaped shock absorbing cartilages that sit on either side of your knee cap (patella) Basically you have a tear in the posterior horn of your meniscus (back bend of meniscus) Usually surgery is needed to either repair or remove part of it.
The patella is your knee cap. There is cartilage that lies behind it to keep it from rubbing the other bones. There is a defect in this, probably a small hole that has been rubbed into it. Once again, surgery can be done or they may want to try injections called Euflexxa or Synvisc that help lubricate the knee and stimulate growth of new cartilage. If this is an option, choose Euflexxa over Synvisc, my opinion is Euflexxa is better.
Your PCL is the posterior cruciate ligament (1 of the 4 major ones) . It is located on the back of the knee. Something is rubbing against it irritating it but with your report I'm not sure. Sometimes you develop bone spurs that can rub against ligaments and cartilage and irritate it.
enthesiopathy is a disorder of tendons attaching to the bone. Most of the time it is due to inflammation. So where all of those attach to the bone there is inflammation there.
Cystic ganglion is a non cancerous cyst that are very common in the knee. A lot of people have them and do not even know they are there. This may be a finding that was or is not causing symptoms but if you have to have surgery the doctor will most likely remove it.
Effusion is the medical word for swelling so there is some mild swelling around your knee cap .
Hope this has helped, if you have any further questions please let me know. Have a good day. Good luck with your knee!